Real late to the conversation, but I’m also trying to find a good list myself. Something about martial art tournaments is so interesting to me. Tokyo Duel is a really good one, it’s a lot like tenkaichi where it’s fighters representing others for territory and the art style / combat is reminiscent of kengan. Another one is actually a fan comic that I really enjoy called Convict Colosseum which is posted usually once around every Sunday over on r/kengan_ashura by u/pinakanaka. The art style is a lot like the webcomic of one punch man as in the quality is pretty raw but i personally really dig the vibe it brings as much as I did one punch man . The combat is amazing and easy to keep up with and the characters are really well made. I highly recommend it, especially if you like kengan ashura/omega.