He has sandy blonde hair that may have been dyed, judging from his dark sideburns and eyebrows. He has a large muscular build and is often seen scowling or yelling at someone (particularly, Futakuchi Kenji).
He is loud and strict and takes the game seriously. He often argues with and threatens Futakuchi Kenji, a problematic junior who doesn't show much respect for his seniors. He is quite competitive and belligerent: when he saw Karasuno at the Spring High, he gave them the middle finger and made a face without holding back at all.
Spring High Preliminary ArcEdit
Tokyo Nationals ArcEdit
Along with Aone and Kenji, it's shown that Yasushi has pretty good blocking skills. All three make up the Iron Wall of Dateko.
Jumping Reach: 330 cm
- Favorite Food: White bean paste monaka
- Current Concern: How many "packs" of abs is it possible to have?!
- His star sign is Scorpio.
- He is the series' biggest eater. 
- In Haikyuu's first popularity poll, Kamasaki placed 33rd with 338 votes. In the second, he rose to 29th with 1,420 votes.
- Yasushi (靖志) - Will
- Kamasaki (鎌先) - Sickle