Sani vs Gowther: Sunny win hard diff
Zebra vs Ban: more likely a stalemate
Toriko vs King and Meliodas: the 36 ren kugi punch will be reflected by a full counter, then king use his sacred treasure...
Coco vs Diane: sadly, i don't remember any feats from this version of coco (T_T)
That's an odd order to go but let me make a few corrections:
Sunny vs Gowther: odd matching between these two, but yeah Sunny should win that.
Zebra vs Ban: Ban may be immortal, but he's shown that he can be beaten into submission, which is exactly what Zebra will do.
Toriko vs King an Mel: 36 ren Kugi Punch is an on contact melee punch. Mel can't reflect that. But if he did somehow end up fighting both at once, he would lose.
Coco vs Diane: Another odd match-up, but Coco would win with superior tactics and poisoning her easily.