I can't see Doomsday being all that much different I mean Lex is sorta a Brawler, Grudy is a grappler and Bane seems like a combination of both. How much different can they really make Doomsday?
because he really has nothing to him, "he killed superman" is his whole appeal he's just a mindless brute with no character depth, i dont even see what special moves or character trait he could have tbh
Some might not know, but Doomsday is actually extremely fast, so that could be one of his trademarks.
1) Make him faster than Bane and Grundy, but still balance it out of course, since being fast and trade a lot of damage? Too much,
2) Let him send shock waves in front of himself with punches against the ground,
3) Let him grab and throw opponents away,
4) Give him the ability to leap a good distance,
5) He should be able to shoot his bones (spikes),
6) Maybe doing it so that his special ability makes it so that you can't attack him with the same attacks over and over again, because he adapts to the way he gets killed, so you can't kill him the same way twice (for example, if he uses the ability and has a 10 seconds buff and then Batman comes along with a easy combo-loop, the combo would basically not do any damage at all, after the first loop is over),
7) For his super either let him punch the opponent to the core of the Earth, or let him smack the opponent into the ground and then jump and stomp them into the ground over and over again, shattering everything around during the process,
8) Let him shout as loud as he can and therefore pushing enemies back and maybe stunning them for a moment, if he does the EX-version (then he could leap to them),
9) AND THERE IS EVEN MORE YOU CAN DO WITH HIM!