Other Ideas would be
1. Leonardo X Cassandra Jones: After Cassandra quits the foot clan, she tries her best to become a trusted ally and friend of the turtles. It’s slow at first but they grow to trust her. Things go wrong when a mission to hunt down more Oozquitoes turns into Casey getting mutated! (mutant reptile girl with metal powers: metallic scales, grow metal blades and metal manipulation.) She screams and runs off, thinking she’s a monster and it’s up to the new leader, Leo, to calm he’d down.
2. Raphael X Jessica Jaclyn: After become Raph’s debut as a wrestler and wanted to fully manage him but couldn’t find him. She searches everywhere and couldn’t find him. It seems hopeless as she heads to her next match as the champion until she’s bitten and turned into a mutant! (Similar to Looma from Ben 10) this gets the turtles attention as they go to try and stop her, finally allowing her and Raph to meet again.
3. Michelangelo X Sunita: April brings her to the lair but finds only Mikey as everyone else it out. They didn’t hit it off much until Mikey turns in to a cooking show, Sunita’s favorite! They both watch as April leaves them be, talking and growing closer to each other as they shared similar interests. Neither of them expected to end up agreeing to a date by the time everyone comes back.