Battat headcanon is: originally he was skinny like da other pippins BUT! Ever since the Mike gig he began losin more weight cause he was skippin meals causs he was too busy. BUT!! After a while, Tenna started takin Mike out ta dinner. At first it was with all three of em (after Pluey and Jongler decided to help Battat) but after repeated failed attempts at gettin Battat ta eat (sometimes it worked but for da most part he says later and maybe snaps due to lack of sleep :sadface:) they decided to just ask Tenna out to dinner more often and make Battat Mike go, eventually becomin an everyday thang. BUT!!! Because Battat's lack of sleep, sudden change in diet from Nothing to Something, and probs a lack of rigorous exercise from stayin in one spot theorisin for hours on end- (and maybe da more physical tasks bein more of a Jongler Mike thang [refer to that one post bout each Mike gettin different tasks from @/modernmouthmike]) (yes I do believe he paces and flails around when excited but not enough to do a lot in terms of workin out)- he started gainin weight and eventually didn't even have ta use da Mike suit anymore, it's just him wearin a suit and mask.
and Jongler, Battat, and Pluey are all in a polycule. and they all take turns dating Tenna until da jig's up. den da polycule grows. <-(my jingle jingle backrooms)