please remember rate this skript

Every counter what you do, need own permission.
example: counter named "pvp" need permission node killcounter.pvp
if you want use top list use permission node killcounter.pvp.top
and if you want see other kills use permission node killcounter.pvp.other

To make counter what count zombie kills and named zombie use commands:
/kcpa counters create zombie
/kcpa counters addmob zombie

And if you want add mob in use counter you need select that counter first, example:
/kcpa counters select mob