Regardless of if we retool for Odyssey or normal game modes, I feel like making antags more versatile and less dependent on specific abilities/tropes should be our goal.
Ling has already benefited from giving you a 10 point loadout from the start and moving away from a need to drain people. The ability to change your voice, manifest clothing, ect lends itself well to being able to switch identities on the fly and I’ve used it to pretty decent effect in the past.
Vamp is probably the least flexible role at the moment due to the need to drink blood and their abilities being largely combat related. A shift in abilities to be more utilitarian and the ability to get normal blood from animals would be a good place to start imo.
I also agree with Dreamy that most people are hesitant to play onship antags and screw with their relationships, even if it’s not canon. Even when I play a character like Shaw who is supposed to be unlikable and regularly an antag it gets stale after a while and I can’t truly change things like fingerprints or DNA without admin bus. Some mechanic to allow for antags to truly change their character when they roll antag but remain onship would be good.