Top 6 Best Stunners

1. Krampus Purple Guy: Most consistant stunner on the list, long stuns, and supports the team further by producing 35% more damage to stunned enemies.
2. Frostmancer Withered Bonnie: 1s stun, great if you don't upgrade it to single.
3. Mangle: When an enemy is within its range for a bit, it will stun them for a while. Bad DPS and attack type but the stun is good.
4. Time Lord Withered Freddy: 
   Everything below will be similar. Stuns all enemies for 8s on activation, super good for when a boss first spawns in. Gives your units extra attacking time. 100s cd.
5. Old Man Consequences: When your base hits 0, stuns all enemies for 6s. Great for when your leaking enemies.
6. Golden Freddy: Every 20s stuns for 2s. Not great, but not bad.