as any fat fuck on the beach would: showing off tons and tons of skin and splashing about in the water like a pod of whales!

yori would insist on wearing a bikini even though it's extremely clear to everyone present that there is no fucking way that she can keep herself decent with all that mass surging outwards. sad but true

shoyo wouldn't give a shit one way or another if it's a nudist beach or not. he's got all that flab and he is going to FLAUNT that shit and people are going to drool watching him wobble about and leaving elephant stomps in the sand because of how huge his cankles are

lee would likely show up in swimming shorts and would be unable to wear a shirt because of how big her hammy arms are... unfortunately because of how pancakey her tits are people think she's a boy and it annoys the SHIT out of her

sekishusai is not one for relaxing on the beach but i can see her trying to get a tan and failing because she's pale like snow. beyond that she could possibly waddle around in the water and muttering something about how much blood it would take to stain it red

kumonryu is a lunarian and doesn't really experience normal earthen seas like we do. i imagine that she would try to get into the water but she ends up walking on it and she just can't get inside it no matter how hard she tries. someone get her a piña colada...

hua would likely stay in the water. water is good at preserving bodies, after all, so by default she's attracted to bodies of water like the sea. that, and she can do a SICK impression of jaws with her clawblades...