Yasashii

優しい - yasashii - gentle ( ヤサシイ katakana i THINK ) 
wakai's older cousin, i and u's teacher and the leader of team saru

• notoriously lazy and probably makes wakai do things for her if she can manipulate him into it

• sunbathes a lot/falls asleep in the sun and forgets sun lotion so shes always either tan or red (but naturally as pale as wakai)