Tsubaki is the main antagonist at the beginning of the story. He is the 8th Servamp who should, originally, not exist - that may be the reason the other Servamps did not know of him at the beginning. He is also called "Who is coming?" Tsubaki is the Servamp of Melancholy. He often laughs for no reason just to find it boring a few seconds later. When he is in animal form, he has the shape of a two-tailed fox.
In contrary to the subclass of the other Servamps - his subclass can face the sunlight and are often good fighters.
Tsubaki has short black hair, red eyes, and wearing sun glasses. He wears black coloured yukata with red camellia flower patterns on the sode (the loose arm part of yukata) and red obi that ties the yukata around his waist. He also wears white haori (Japanese traditional jacket) with the same red camellia pattern and a pair of geta (Japanese traditional wooden sandals).
In episode 6 of the anime his attire briefly changes to a white suit with black shoes under said suit he wears a grey shirt with a white button up vest and a black tie he also seems to have another jacket over the suit this on being black
In the past his attire was largely same as his main attire save for his black sunglasses and white haori
Tsubaki has a strange sense of humour, often laughing at the simplest thing only to find it boring a few seconds later. He claims to hate humans and his vampire siblings, seeking to start vampire-human war. When it comes about fulfilling his goal, he is merciless and has no hesitation to kill innocent humans because he doesn't like them, simply stating that it's fair.
Beneath this trait, he can feel compassion or at least empathy for those in a situation similar to his own, whether they are human or vampire. One of such example is when he saved Sakuya and made him his subclass despite being a human. He cares greatly for all of his subclasses, crying for them when they died, and this also enraged him enough to personally capture Lawless after he killed his subclasses.
When he was born exactly is unknown, but he is in fact the youngest of the Servamps. He seems to have a close relationship with the creator of Servamps that he refers as "Sensei" (meaning teacher or master). One night, he witnessed Sleepy Ash in his black lion form after he killed their creator, and Tsubaki seemed devastated at his creator's death. Since then, he has been looking for the real identity of the black lion to question why he killed their creator.
Hundreds of years later, somehow, he was once owned by C3 - the organization which is said to work for the coexistence of humans and non-humans. From the flashback, it seemed that Tsubaki is used as a test subject for some experiment. According to Shuhei Tsuyuki, Tsubaki fled C3 and then turned against them.
Some years prior to the storyline he finds the young Sakuya Watanuki who has just lost his sister through suicide his parents forced her into to get money from their insurance. Tsubaki gets, how guilty Sakuya feels because he lied to the police - he considers himself responsible for her death, and told him that it wasn't his fault that his sister died. Probably knowing about the future, Tsubaki promises Sakuya, that he will come and pick him up once "everything" is over. Six years later when Sakuya is also forced into suicide by his parents, Tsubaki fulfilled his promise and saved him by turning him into his subclass.
He is first mentioned by Belkia while fighting Sleepy Ash, now goes by the name Kuro, and Mahiru. He then appears the next day, confronting Mahiru and Kuro, and explains his plans and goals for the future: killing a lot of humans and all of his siblings because they don't know him. He talks to Kuro and asks him, if he would deny, that this world is boring and nothing ever happens. He declares war to his brother - but Kuro thinks Tsubaki might mistakes him for someone else because he does not know about a brother called Tsubaki. Hearing these words Tsubaki falls into laughter about how none of his siblings know about him as he introduces himself as his youngest brother and the eighth Servamp of Melancholy.
He then directs his attention to Mahiru, telling him that it doesn't matter what happens as long as it's interesting to him. He continues saying that no one knowns him and nobody in the world understand his feelings, to which Mahiru points out that Tsubaki is simply lonely and nothing interests him because he doesn't face his own feelings. Tsubaki confirms this and that's why he wants to start a war. In attempt to stop Tsubaki, Mahiru tries to forcefully give him a name, prompting Tsubaki to try to kill Mahiru before he could done so, but the Servamp of Lust, All of Love, now known as Snow Lily, interferes using his illusion, saving Mahiru and Kuro.
He appears with Belkia again, eating at a sushi shop and welcomes Sakuya who just killed a subclass. They plan their next move to lure Mahiru and Kuro into a trap, which they succeeded. He appears beside one of his subclasses, Otogiri, watching Kuro starts to lose control and looking forward what will happen. However, he soon changed his mind and leaves. He then meets Mahiru again by a coincidence in a sushi bar and Mahiru uses this opportunity to ask how Sakuya became his subclass. Tsubaki reveals Sakuya's background and mocks Mahiru how he doesn't understand Sakuya despite being his friend. Sensing Kuro's murderous intent and not wanting to fight now, Tsubaki takes his leave.
He is seen playing mahjong with his subclasses, Belkia, Otogiri, and Shamrock. While playing, Shamrock asks why Tsubaki hasn't dispose of Sakuya who may betray him soon, but Tsubaki simply change the subject to their next plan, deciding to serve some "fireworks" and take everything back since "Sensei" is tired of waiting as well. It turns out that Tsubaki orders his subclasses to bomb places that involves C3, some of them are Mahiru's school and a place where summer festival is being held which Tetsu Sendagaya, the eve of Servamp of Pride, able to stop.
Attack at Alicein Mansion
Sometimes afterwards, he sends Otogiri to sneak into the mansion of the Aliceins to take down Lily. Otogiri succeeds in destroying the contract item that causes Lily to lose his power, and then receives call from Tsubaki who thinks her interference was too quick, but Otogiri defends her decision that the time is perfect to destroy Lily's contract item. When Otogiri bumps into Mahiru and Kuro who came to help Misono, he asks Otogiri to give the phone to Mahiru so he can talk to him, so Otogiri put on a speaker. Tsubaki explains that by destroying the item that constitute the contract between servamps and eves, the servamp's body will regurgitate the djinn they are containing in their body. Tsubaki reveals he intends to repeat the same process to his remaining servamp siblings to fill the world with djinns and he feels he is getting closer to his goal before turning off the phone as he lost interest.
Capturing The Greed Pair
Using a trap, he lures Licht Jekylland Todoroki, the eve of Servamp of Greed, Lawless, to Japan under pretext to hold a piano concert. In reality, Tsubaki plans to defeat Lawless and Licht as he orders many of his subclasses to be audience of Licht's concert and then kills them. But things doesn't work the way Tsubaki had planned and instead of Lawless beeing defeated, it's Tsubaki's subclasses who were nearly annihilated completely. Deeply shocked and hurt, Tsubaki personally confronts Lawless and captures him, while his strongest subclass, Higan, captures Licht.
Shortly after Higan captured Licht, Tsubaki calls Higan's cell phone that he had dropped and to his surprise, the one who answered is Misono who picked the cell phone by a chance. Mission reveals that one of his subclasses that has survived from Lawless' attack, Lilac, is in their custody, so he demands Tsubaki to trade the Greed pair with Lilac. Tsubaki agrees he won't harm the pair further, but bluffs that he won't let them stay together, convincing Misono and the others that Tsubaki is placing the pair in separate locations beyond the allowed distance between eve and servamp, which will result in Licht's death. Despite agreeing to the trade, Tsubaki visits Mahiru, Misono, and Tetsu to look for his Lilac, but finds that none of them are with Lilac. He then receives call from Misono who tells him the place for the trade, and Tsubaki decides to go alone, assuring his subclasses that even if he is being betrayed, he will betray no one.
At the promised place, he is shocked to be confronted by Lawless' subclasses who all wears whale costumes and demands Tsubaki to return their servamp and eve. He was thinking of settling things by switching with the keys to Lawless and Licht's rooms and asks where his subclass is. Guilderstern tells him that Lilac is inside one of their costumes as they all attacks him. Tsubaki tries to attack back, but then realises that he will risk injuring his subclass if he attack carelessly and the costumes are thick that it's hard to which costume that holds Lilac. Despite knowing they're buying some times, Tsubaki decides to play along with their plan as long as there's a possibility that his subclass is there.
While doing so, Tsubaki saw Kuro in his black lion form arriving at the tower with Mahiru. Recognising the black lion as the one that killed his creator hundreds of years before, Tsubaki smiles wickedly. Belkia then sends Servamp of Pride, Old Child, to Tsubaki's location, and succeeded Tsubaki in defeating him. He quickly goes back to the tower, taking Lawless' contract item that Lilac took. He tells Tetsu of Old Child's fate and now plans to do the same to Lawless, slicing Lawless' necklace that causes the djinns the came out from his body.
He then confronts Kuro, asks does he now believes his claim to be the eighth servamp and reveals he has been looking for him ever since he first saw him in his black lion form after he killed their creator. Kuro tries to reach Tsubaki by speaking with him, to which Tsubaki points out that he didn't speak properly first with their creator and then killed him just like that, so Kuro should do the same now, something that Kuro replies he will regret if he does. However, Tsubaki dismisses his claim because the burden of his regret is too light. Tsubaki then asks why Kuro killed their creator. When hearing that Kuro killed him because his research is too dangerous, he reveals that C3 are continuing that research. He also laments at the fact that his creator never talks about him at all to his siblings.
Before the conversation can go further, C3 magicians Tsurugi Kamiya, Junichirou Kurumamori and Yumikage Tsukimitsu appears and corners Tsubaki with their teamwork. When he is nearly defeated, Kuro prevents Yumikage from shooting him, allowing Tsubaki to inflict injury on Tsurugi. Higan then uses his flames to protect him as the subclass tells Tsubaki to escape with Lilac. Tsubaki protests that there's no way Higan himself and the other subclasses can follow him, but Higan simply tells him to go and reminds him of his own words that he won't betray anyone. Reluctantly, Tsubaki escape together with Lilac. A few days after the incident, Tsubaki tells Lilac to tell all of his subclasses to forget about him and live freely, and afterwards the rest is his problem alone.
Weapons and Abilities
- Like the other Servamps, Tsubaki can change between and animal form and his human form at will. His animal form is a black two-tailed fox, he can also speak while in his fox form.
- He has been shown to be able to generate a katana sword from his right hand under his yukata. Red camellia flower petals fall down from his yukata sleeve before joining together and becoming a black katana surrounded by red aura. In the anime, he is shown able to produce more than one katana and controls it midair.
- Strength: 6/10
- Tactics: 9/10
- Cooperativeness: 3/10
- Mental: 6/10
- Appearance: 9/10
- Charisma: 9/10
- His favourite food is Inari-Sushi and everything with matcha flavour (Japanese green tea).
- His favourite drink is canned red-bean soup.
- He doesn't like his siblings and hearing about other people's dreams.
- He likes long walks.
- His favorite color is red.
- He can hold his liquor well, but will get drunk easily on wine.
- In drama CDs, Licht takes a liking to Tsubaki's fox form just like he does to Kuro's cat form, fondly referring to him as "Kitsune-san" (Mr. Fox).
- He is very sensitive about his height.
- His seiyuu (Tatsuhisa Suzuki) is the lead singer of OLDCODEX, the band who sings the opening theme of the anime, Deal With.
- In the first popularity poll he came sixth with 1570 votes.
- His English voice actor is engaged to Otogiri's English voice actor.
- His star-sign is Capricorn.
- He is left-handed (as seen when he wields his katana).
- Tsubaki wonders if Mahiru will become the key.