Tank Dokken

Hirohiko Dokken is the main protagonist of Dobutsu Boys, a series about a party-loving rhino who goes by the name Tank, and his boyfriend/friends of the all-male boarding school Dobutsu no Boarding Education for Young Men.

Personality
Hirohiko, or "Tank" is a fun-loving guy who devotes himself to his friends.

Tank also has autism, and is generally accepted by a majority of the population. It's usual to see Tank stimming via rubbing his horn on his friends and boyfriend and/or bobbing his head up and down. Tank is also very sexual in nature, making sex jokes or references frequently. Sexuality is one of his key special interests, the others being music and drawing. Tank is very open when it comes to music, very willing to listen to almost anything.

As a natural-born leader, he calls ideas out and uses his charms to play about. Despite this, Tank is very intelligent, and even skipped a grade, leaving him the youngest in his harem and more naive and immature, for example, not understanding Marshal's sarcasm or Bud calling him a baby. Tank has a high level of confidence, being proud of himself or his friends and boyfriend.

Relationships
Bud- Tank and Bud are loving boyfriends, and bring out the best in each other. Tank brings Bud to a new level of confidence never seen before, and Bud brings support and care for the rhino. Before the two officially started to date, Bud was in a previous relationship with Chief. This relationship ended when Chief was cheating on Bud. Bud lost his virginity to Tank and loves him very dearly, where Tank's first official relationship was with Bud.

Kidd- Tank's first friend in the boarding school was Kidd, and Tank lost his virginity to Kidd a week after they befriended each other. Throughout the series, Kidd has a massive infatuation for Tank, despite both of them in a relationship with different people. (Gruff and Bud, respectively).

Marshal- The two are common enemies, both despising each other to a huge degree. Tank usually doesn't take Marshal seriously, laughing at him constantly and roasting him when around the squad.

Family
Satoshi "Sweater" Dokken- twin brother, older by 5 minutes

Chrisopher "Chris" Dokken- father

Haruka Kondo Dokken- mother