RANDOM OC HEADCANON FOR KONKI YASUHARA:
Konki is normally kinda indifferent to his weight; however, he does hate how it makes him look like the most unflattering image of an otaku. In fact, once he's found out by the secret organization responsible for maintaining the Earth's safety from dark forces, they begin training him to help him accept his role as The Rainbow Sentinel mostly as a way to get in shape. Not that he minds since he has been meaning to lose his "otaorb", a portmanteau of otaku and orb.
That being said, he never really loses the belly. He just becomes more agile and flexible. That said, I do imagine that the training/workout montage to be something like the above gifs featuring Steve/Rayburn Jr from Rumble...




