Kenichi was very popular before baki and kengan came out, they were different times people liked echii and self-improvement now they just want to see blood hahaha, if you plan to use any of them or all of them you should go first kenichi and you could fuse baki and kengan in a world!
The only thing I truly don't like about kenichi manga is the ending. Like it didn't feel like the journey end even when there's a small scene showing pic..
Author-san try Mudskipper DNA this species can move no repel forward so fast that it's movement is like it teleport and it is nearly impossible to catch. and also why not try cymothoa exigua too well make it able to control biological crenevours and omnivorous.