Development and updates on this website have come to an end. There won't be any more update in the foreseeable future.
More details here 
Chainsaw Rick
Unit Analysis by Team BethelFrankel
Class
3* Detonator with some knockback.
Overall
D+
Advantages
+Rare knockback on Chain Combo
+Good for Extra Story 2-6
Disadvantages
-Literally only useful for Extra Story 2-6
-3* DPS are completely unviable
Explanation
Chainsaw Rick is objectively terrible on every front, barring the strange decision to make ES 2-6 completely unplayable unless you run someone like him. For those who haven't played it yet, ES 2-6 requires you to stun the boss twice with knockback effects before you can deal any damage, and Chainsaw Rick is one of the only units capable of consistently getting the knockback you need. That said, the boss itself is really easy, so you don't need to put any levels into Rick if you don't want to.