Tobio Ikuse
Tobio Ikuse
Kana 幾瀬 鳶雄いくせ とびお
Romaji Ikuse Tobio
Surasshu Doggu
Race Human
Gender Male
Nicknames Slash Dog
Tobi (by Lavinia)
Hair Color Black
Eye Color Pale Grey
Equipment &
Canis Lykaon
Personal Status
Relatives Ageha Ikuse (Grandmother) †
Unnamed Great-Aunt
Unnamed Parents †
Shuri Himejima (Aunt) †
Akeno Himejima (Second Cousin)
Baraqiel (Uncle-In-Law)
Suzaku Himejima (Second Cousin)
Suou Himejima (Granduncle)
Hanezu Himejima
Affiliations Ryoukuu High School (Former Second-Year Student)
Grigori (Agent)
Slash Dog Team
Nephilim Institute
Himejima Clan
Status Alive

Tobio Ikuse is the main male protagonist of SLASHDØG. He is a former second-year student at Ryoukuu High School and one of the survivors of the "Heavenly of Aloha incident". Later, Tobio discovered that he is the current owner of the Longinus, Canis Lykaon earning himself the title of Slash Dog. After saving his friends and teachers, Tobio joins Grigori becoming a student of the Nephilim Institute.

He also appears in High School DxD where is now a member and one of the top fighter of Fallen Angel organization Grigori.


Tobio is a seventeen-year-old high school student with black hair and pale gray colored eyes.


Tobio is a quiet and introverted young man. Suffering the loss of his parents before he got to know them, his grandmother and primary caregiver and most recently his best friend Sae Toujou have taken a severe emotional toll on him. Tobio is also extremely gentle and kind as noted by Natsume and Lavinia. Tobio cares deeply about his friends, willing to face great danger to help them as when he decided to fight Utsusemi Agency to saved Sae and he risked his life to block a powerful attack from Seiryu Kushihashi to defend Kouki.


Tobio is a descendant of the Himejima Clan via his grandmother Ageha Ikuse who is an exiled member of the Himejima Clan. He was a rare instance where he activated his Longinus, Canis Lykaon and Balance Breaker from birth. Because of this, his grandmother used a Buddhist sealing ritual to seal away the Canis Lykaon. At some point, his parents died before Tobio was old enough to remember them.

Unfortunately, when Tobio was roughly twelve years old his grandmother died too, and as a result, he ended up being raised by the family of his best friend Sae Toujou.


Tobio was introduced in Volume 1 of the light novels, when a few days before his school trip on a luxury liner, he had caught a severe fever leaving him unable to join, just before his childhood friend Sae Toujo left for the trip, Tobio gave Sae a good luck charm for her travels. Four days later, Tobio notices the head news where 233 of his schoolmates all disappeared in the luxury liner accident, he was shocked and in despair especially at the loss of his friend. Afterward Tobio and the few who were absent from the trip were chased by the media and questioned their input in the incident, eventually, they've all transferred to different schools to avoid the reporters. 2 months after the disappearance of his classmates, while on his way home after partings ways with a friend, Tobio accidentally encounters two of his friends that went missing in the accident, Kouta Sasaki and Sae. Chasing after Sasaki, Tobio eventually catches up but to his horror finds along with a lizard-like monster who was chewing on a dog. Sasaki seemingly devoid of emotion signals the monster to attack Tobio.

Tobio tries to fight back in desperation but to no avail and just as he's about to be killed, he was saved by the timely arrival of Natsume Minagawa, who turns out to be a fellow survivor who was absent on the trip from their previous school like him. She takes him to a family restaurant to calmly explain the details, such as that all of their old classmates were taken by a group called the Utsusemi and paired each of them with a creature like Sasaki was. She then handed him an "egg" with a beating pulse and that he must take care of it for he will die without it. Natsume then suggests for them to leave and then whispers in his ear she'll come by his house later. Tobio arrived at his apartment taking everything he had experienced today, he placed the "egg"-like object in the bathroom and went straight to bed.

Tobio woke up at around midnight, he suspects that someone was peering through his window, he checks through the window and noticed a boy with a large spider clinging to the wall of the condominium. Tobio was frightened as the boy and his beast came after him, he tries to escape while dodging shots of spider silk, however, made a lone girl with a giant frog appeared from the front exit and also attacked him. Cornered by the two, Tobio hurried to the bathroom with the Utsusemi beasts right behind him, he manages to get a hold of the "egg" but appeared to be cracked open, he panicked as the beasts tear through the door. He tried his best to fend for himself but was eventually cornered in the tub by the two beasts. As he panics, Tobio has a flashback to when his grandmother placed a seal on him when the boy came to, he noticed a blade had stretched from his shadow piercing the frog which caused the spider monster retreat. From his shadow emerges a small black puppy with a blade on its head.

High School DxDEdit

Tobio was first mentioned in High School DxD by Azazel who explains that he is away on a mission. He also acts as Azazel and Sirzechs Lucifer's bodyguard when they were confronting Hades but does not appear as he was stationed outside.

He eventually makes his official appearance in the Hyoudou Residence to act as a support for the residents of that house. He later participated in the meeting for the formation of D×D, becoming a member of that team.

Abilities and Power Edit

Master Combatant: Tobio is shown to be an adept fighter. Having a natural talent for combat, with continous training, Tobio's fighting skills developed at an accelerate rate, eventually becoming strong enough to fight equivalently against extremely powerful enemies such as Seiryu and Ouryuu.

Master Scythe Wielder: Tobio has proven to be naturally adept at using scythes as shown in his sparring match against Vali. With continuous training, Tobio's skill became great enough, he is capable of injuring Seiryu Kushihashi the guardian of the Azure Dragon and also the current Ouryuu Naikiri who is the strongest guardian of the Yellow Dragon of all time.

Enhanced Strength: After joining the Grigori, Tobio began an extremely intense training regimen to train his body to perfection, making him significantly stronger than before, enough to overpower supernatural beings such as Youkai with refined brute force.


Canis Lykaon(黒刃の狗神ケイネス・リュカオン, Keinesu Ryukaon): Tobio possesses the Longinus, Canis Lykaon, which takes on the form of a small black dog that he named Jin. It is an Independent Avatar-Type with its own instincts. Jin is able to produce blades from its body and transform itself into a sword. During their fight against Doumon, Tobio awakens the abilities to let Jin move and attack through shadows along with being capable of growing its black blades from shadows as long as it is within his field of vision. After their final fight against the Utsusemi Agency, Jin had grown into a full grown black dog and lost the ability to grow blades from his body. Jin can now create edged sword in his mouth to fight. In volume 2, Tobio gain ability to growing its black blades from shadows much Jin. 

  • Darkness Aura: Tobio is capable of using the Canis Lykaon's darkness based powers to enshroud himself in an aura of darkness which significantly enhanced his physical prowess, having first manifest it to break free of Kazuhisa's Clay Golems. And later against Seiryu Kushihashi, he was capable of using his dark aura to enhanced his physical strength and speed to overpowering the latter.
  • Night Haken: This is a technique, which summons a black blade from the shadows around him and is able to generate one from even his opponent's shadows catching them off guard.
  • Scythe: After the fight against the Utsusemi Agency, Tobio learned to produce scythes with his Sacred Gear which he uses as his main weapons for melee combat from his shadow.

Night Celestial Slash Dogs

  • Night Celestial Slash Dogs: The Balance Breaker of Canis Lykaon, which covers Tobio with darkness turning him into a humanoid black hound with a total of six tails; while Jin turns into a big black hound. In this form, Tobio is granted enhanced strength and is able to create innumerable black blades including being capable of tinging the skies and earth in darkness. In Volume 3, Tobio can summon Ame-no-Ohabari that has been infused with the Shinto Fire God Kagutsuchi's power, enable it to generate black and red flames.