The stun effect makes the opponent’s character unable to use his skill. List of characters who have stun skills. From SR to SSR
Child Emperor is one of the best SSR characters. He has a skill that attack each enemy in a row and have 50% chance to afflict stun to main target for 1 round.
Sky King is the sr character of a faction monster. The ultimate skill hits one column with 50% chance to afflict stun effect to main target for 1 rounds.
Lightning Max attacks one opponent and gives a burn effect and also a stun effect.
Hammerhead have a stun skill that will attack just one enemy and 50% chance to afflict stun.