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Main characters
Haru Kaidō
Voiced by: Tomoaki Maeno (Japanese), Travis Willingham (English)
A young man who lived in Canada with his mother for eight years before moving to Japan.
- All of the Other Reindeer: Got bullied because of his green eyes.
- Amnesiac Hero: He gets in an accident and forgets about Ren and the time he spent with him.
- Big Brother Instinct: For Ren, Aki and Shima.
- But Not Too Foreign: Haru is of mixed heritage, being three-quarters Japanese and one-quarter American.
- Butt-Monkey: In the first episode, he was attacked by Ren and belittled by his mother.
- Crazy Jealous Guy/Green-Eyed Monster: Over Ren; he beats up Juuzen twice after seeing him on top of Ren (he's trying to see if he has multiple hickeys.)
- Cuteness Proximity: Fawns over Ren.
- Cuteness Overload: Over Ren on occasion.
- Heroes Love Dogs: As a child, he befriended two wolves, both who die four years after he returns to Japan.
- Nice Guy: Emphasized more on the first episode.
- Not Blood Siblings: With Ren and the Kaidou siblings.
- The Protagonist
Ren Kaidō
Haru's adoptive brother.
- Anguished Declaration of Love: He makes one to Haru when he goes back to Canada.
- But Not Too Foreign: After having his past investigated by Mikiko per Haruko's request, it is revealed that Ren is three-quarters American and one-quarter Japanese. It was also recorded that his birth name is either "Ren" or "Allen."
- Dark and Troubled Past: He was abused at the orphanage and barely had any friends. As a result, he finds it difficult to trust anyone.
- Hates Baths: Haru has to literally drag him, kicking and screaming, into the bathroom.
- Heroes Love Dogs: Like Haru, Ren loves spending time with wolves. He also takes a liking to Tanuki, who also gets attached to him.
- Meaningful Name: The character 'rei' in his name means "really small." Ren is 16 and is only 155cm/5'1"
- Not Blood Siblings: With Haru and the Kaidou siblings.
- Older Than They Look: He may not look it, but he's actually a teenager.
- Sugar-and-Ice Personality: Lampshaded by Haru when imagining Ren's ranking hierarchy; Ren generally shows the ice side of his personality, but the sugar side comes out when Haruko is involved.
Supporting characters
Aki Kaidō
Voiced by: Yoshitsugu Matsuoka (Japanese), Todd Haberkorn (English)
One of Haru's half brothers.- Big Damn Heroes: He arrives at Haru's apartment just in time to save Ren from Asakura.
- Crazy Jealous Guy: A non-romantic example with Haru. He refuses to accept Ren as his new brother and wouldn't share Haru with him, though he eventually reneges on that.
- Red Oni, Blue Oni: The red to Shima's blue.
Shima Kaidō
Voiced by: Takuma Terashima (Japanese), Sean O'Connor (English)
One of Haru's half brothers.- Brainy Brunette: He's the one who figures out that Haru has Ren living in his apartment.
- Red Oni, Blue Oni: The blue to Aki's red.
- Scary Shiny Glasses: Not as scary as his mother.
- The Stoic: He's more reserved than his twin brother.
Takashi Kaidō
Voiced by: Isshin Chiba (Japanese), R. Bruce Elliott (English)
Haru's biological father.- Deceased Parents Are the Best: From what's shown of his first appearance, he was very doting and supportive.
- We Hardly Knew Ye: He, along with his wife, die in a car accident, which is responsible for Haru's memory loss.
Ruri Kaidō
Voiced by: Houko Kuwashima (Japanese), Stephanie Wittels (English)
Haru's adoptive/stepmother mother.- Deceased Parents Are the Best: From what's shown of her first appearance, she was very doting and cheerful.
- Odd Friendship: She proudly admits that she's friends with Haruko. Their personalities make one wonder how they get along.
- We Hardly Knew Ye: She, along with her husband, die in a car accident, which is responsible for Haru's memory loss.
Haruko D. Dieckmann
Voiced by: Atsuko Tanaka (Japanese), Anastasia Muñoz (English)
Haru's and Ren's mother who lives in Alberta, Canada.- Berserk Button: Haru addressing her as "Mom" or "Mother".
- Jerk with a Heart of Gold: She treats Haru terribly, but she does care about him and Ren whom she willingly adopted.
- Scary Shiny Glasses: Whenever she's angry about something.
Asakura
Voiced by: Yukiyo Fujii (Japanese)
One of Haru's regular customers.- Cool Big Sis: She seems like this for her younger sister. This turns out to be a lie.
- Dull Eyes of Unhappiness: One of the big indicators of her true nature.
- Stalker with a Crush: When Haru stops serving her, she becomes desperate to see him that she starts following him.
- Would Hurt a Child: She nearly strangles Ren when she was looking for Haru.
- Yandere: For Haru.