osomatsu loves to assert himself as the eldest, and i think a lot of that comes out when dealing with jyushi, through both doting and scolding. osomatsu thinks jyushimatsu is... a lot. jyushimatsu has a boundless amount of energy, and osomatsu just lets it happen, because what else is he supposed to do? despite how strange the word of ososan is, osomatsu consistently remarks that jyushimatsu is one of the weirdest.

what i find interesting about these two is how obedient jyushimatsu is. whenever niisan has a request or demand, jyushi listens! it's weird! because he isn't like that with either kara or choro. that's what makes moments where osomatsu snaps hurts so bad, because it really feels like kicking a loyal puppy. osomatsu's gentlest moments and harshest moments shine with jyushimatsu. the dichotomy of times like comforting his brother through his girlfriend troubles and then kicking him for being annoying is very sibling-like.

they're both very silly and huge perverts, and even if they don't have a lot of onscreen time interacting, they have a lot of fun together. i like them a lot! ketchup and mustard idiots.

notable moments/skits:

season 1 episode 17 — jyushimatsu and a midnight snack, jyushimastu and experiments
season 3 episode 6 — massage