This stuff is copied from the volume 4 canon character profile
Brain: People are always calling him and idiot, but he's actually of average intelligence.
Eyesight: Much better than average.
Physique: Surprisingly muscular. Broad shoulders.
Stamina: Able to stand up to abuse, he has fairly high endurance and durability.
Fighting Strength: Big on brute strength, can power through almost anything.
Hair: A bleached blond. Used to have black hair. Though it's hard to bleach, because the original quality of his hair was good it isn't really damaged.
Earrings: A single stud in his left ear. On his right, a stud and a hoop. The studs are red.
Clothes: Cargo pants and T-shirts. Casual style with stuff like hoods. Likes camouflage.
Shoes: Likes Converse sneakers in lots of gaudy colors.
Age: 16
Birthday: August 22
Blood type: A
Height: 173cm
Weight: 61kg
Shoe size: 26cm
Weapons: Has his own fighting style based on boxing, special gloves
Hobbies: Games, exercise, making plastic models, break dancing*
Special skills: Very good at all forms of physical exercise, break dancing*
* I suspect this is more like a combination of tecktonik and break dancing, considering the music he likes. But really anything with a good rhythm will do if he wants to dance.
Likes:Dislikes:
Colors:warm colorssomber colors
Food:sweets, hamburgers, currybitter foods
Books:mangadifficult books
Music:Euro, trance, electronicclassical
Games:mecha-customization action games targeted at hardcore fanssoundnovel
TV:anime, variety showsnews
Movies:action, comedy, SciFisuspense, thriller
Animals:large carnivores, dinosaurs, dogsmonkeys, chimpanzees
Others:fun pranks, summer, the sea, exercise, Akira**, robotsstudying, free time, cooking
** blink tag mine.
Reference for the type of videogame he likes.
Extra stuff from the author:
"Poor Kengo, always thought of as a manservant, villager, goldfish poop, dog... It's harsh, isn't it? (lol)"
Sorano's Babble:
"Kengo is a lovable idiot. I think everyone had a guy like him in every class. And I'm surrounded by them. (LOL) But in this manga I think he is probably the most human, you know? When he's present the whole story flows easier so he's a huge lifesaver to me! (lol)
Now, being the way he is, a lot of people, starting with Akira, treat him cruelly, but he doesn't let it bother him at all***. It seems to me that he's a fairly tolerant person... Anyway, all he cares about is if it's funny, so I guess he is putting his life on the line to get a laugh... And he's able to get a lot of laughs because it's his lot to have to put up with a bunch of crazy sadists after all... Let's wish him luck!"
***He seems to have some self-esteem issues but he'll definitely overlook any of this kind of behavior from people he likes.