New idea: Zombie Boomer (Not the L4B one, no name ideas)
When exploding, it makes like acid, like a spitter, but doesn't spit it out, this acid will slowly kill you, Every 5 seconds, 1 HP will be lost. BUT, this can be helpful for runners, this can boost you in a way, Maybe by a 20% Run boost, maybe higher jumping
There would be a Adreinale or however you spell it or something will be able to cure it,
Upon death, you will become a Boomer, which leaves tiny acid trails with 0.1 Damage per touch