As I've mentioned before, Tsubasa has an eagle wing on his chest, a small bat on his wrist, and a tiny frog behind his ear. I reckon he'd also have a small teacup somewhere maybe some flowers. He just strikes me as a guy who's have a lot of small ones all over his body
Kyoya gets a big portrait of a lion roaring on his back. It takes three months to finish completely
Benkei has a cartoon cat eating a burger on his upper arm
Hikaru has her star sign on her wrist (Aquarius, obv) and maybe some flowers on her thigh. We love basic bitches
Yu draws on himself a lot and often tries to copy Tsubasa's tattoos. He'd probably get a bunch of cute/lowkey scary animal tattoos when he gets older
Ryo has a big phoenix on his back that intertwines with a lot of his burn scars
Blader DJ has a tramp stamp that no one has seen
Ryutaro would have traditional koi fish sleeves
Aguma would probably end up with a full body of tattoos. All of them have to have meaning to him in some way (a reaper fighting a lion, a map of the solar system, a crimson crown, etc.)
Da Xian has a traditional Chinese dragon going up his back and onto his chest
Mei Mei strikes me as a dolphin-on-the-ankle kind of gal
Nile has a manticore on his shoulder (bull horns, lion body, scorpion tail😉)
Team Dungeon all get marching tattoos of the number 1 on their wrists when they're older. Masamune almost chickens out, but he gets through it after King makes fun of him for it
^After which, Masamune and King challenge each other to get the most ridiculous tattoos they can think of, only to be stopped when Coach Steel intervenes
Klaus has a heart with the sword of Excalibur going through it on his shoulder
Jack tattoos himself at random. He doesn't even remember why/when he got most of them because he does them impulsively
Doji has a cactus on one of his cheeks (not facial)