Blitzen is a red enemy that only appears during the Jolly St. Nick event.
A Rain D. variant which is more resistant to knockbacks (less knockbacks), can knockback the player's cat units, is (strangely) a red unit, and has a small boost in attack and health. However, it attacks slower and moves slower.
The only difference between fighting this enemy and Rain D. is its ability to knockback your cats and the fact that it is a red unit. Using any Fish Cat variant (Crazed, Island, etc.) will be able to kill this unit quite quickly.
Another way is by spamming Macho Cat and Wall Cat at the same time, use attackers that does damage over 1000+ (like Cat Gang and Paris Cat) and most useful is Bahamut Cat. It can do so much damage that in 2 hits, it will be knock backed.
Time between attacks
300 (Area Attack)
May knockback Cat Units. (30%)
This enemy's name is based on one of the reindeers of Santa Claus.