I've been wanting to do a Rumble involving these half-Devil delinquents for a while and DS's recent Rin vs Yuji thread inspired me to go for it.
Round 1: Current Rin (without his destructive personality) vs Denji
Round 2: Awakened/Evil Rin vs Chainsaw Devil/Pochita
Bonus Scenario: A sit and talk between both devil hybrids, as well as a separate one between their employers (Mephisto and Makima).