Daichi specializes in breaststroke, but he can do other swimming styles as well, though he can’t do butterfly that well.
Sugawara likes using freestyle the most since its quite easy to learn. But he can do other swimming styles as well, though his weakest would be the backstroke.
Asahi’s specialty is backstroke, he can’t really do other swimming styles except for butterfly.
Nishinoya’s favourite swimming style is freestyle and breaststroke, though he can’t do backstroke and butterfly at all.
Tanaka loves freestyle, he also likes backstroke a lot. He doesn’t care much for breaststroke and has trouble with butterfly.
Ennoshita specializes in breaststroke, he can do backstroke and freestyle pretty well but he can’t do butterfly.
Kageyama's specialties are butterfly and freestyle, though he can do pretty well with other swimming strokes.
Hinata’s specialty is freestyle and breaststroke, he can’t do backstroke and butterfly at all.
Tsukishima’s best stroke is the backstroke while the breaststroke is his worst. He doesn’t care much for butterfly or freestyle.
Yamaguchi likes freestyle the most, he also likes the breaststroke. He has trouble with backstroke and butterfly.