Add siquids to the mod, they can take over the control of characters like: Atom Eve, Rexplode and all humans except humans that have big durability.
ReaniMen helmet if you put it on injured or dead person you can turn him into the ReaniMan.
Angstrom Levy, he can open portals and can spawn Invincible variants that we saw in the show or randomized Invincible (or any other characters) variants.
Cyborgs, like we seen in the show, Donald Ferguson died about 39 times, if someone died, but head was not crushed or injured heavy you can get the brains out of the head and put in cyborg, and automatically cyborg will have the skin of character whose brain you put inside, it will increase durability and health.