What powers must have zombie MC?
As they get stronger they have to leave the hoard since while it is easier to kill in a group it is also harder to feed. When they get to a certain strenth they also start gettng skills from the people they eat. The skills are also basic until they eat enough people with that skill to level it up.
So let’s say a zombie with a 0 in pistol eats someone with a 5 in pistol there is a certain random chance that they get a 1 in pistol. Then they eat someone with a 3 in pistol and there is a certain random chance their pistol increases to 2 then they eat smeone with a skill of 1 in pistol, they have no chance in ranking their skill up since they already have a 2 skill and the person they ate only has a 1. Of course they could also get a random useless skill like sandstone carving or beer making.