Mona Lisa is a mutated axolotl who comes from the same lab that the turtles did! She and Raph meet while the turtles are investigating their origins further and trying to find all the mutants that apparently live in NYC. Raph is absolutely in love with the amazingly cool biker girl at first sight, but she takes a while to warm up to him tbh
They’re both very very tough people who are just so so so soft with each other and it’s very wholesome. Lisa likes to mess around with cars and other motor vehicles and often takes Raph on motorcycle rides which kind of freak him out. Also-don’t be fooled by how small she is! She can still lift Raph off his feet (she is sooooooo strong it’s insane)
The best/shortest way I can describe her personality is how Daphne is in the Legend of the Phantasaur movie. She will powder her nose, she will break your nose.
and of course we can’t forget the classic leosagi! Yuichi and Leo’s meeting is a bit more spoilerly so I won’t go so in-depth, but let’s just say through some shenanigans involving an investigation the turtle’s are doing, Usagi gets teleported from his universe to the universe of TMNT! He bonds with all the turtles while they try to figure out how to get him back, and he and Leo end up falling for each other.
They are both incredibly stupid and honestly it’s pretty much just your standard leosagi. Leo is a lot more dramatic with his boyfriend, but he’s still a good listener when Usagi tells him about all the stuff that goes through his dumb little brain. They train together a lot and they are also very wholesome I love them.
Yuichi is just so so so so so dumb and stupid and he thinks he’s smart and pretends to be smart but he is dumb.
bonus drawing:
There’s other canon ships in my silly little tmnt iteration, but I just wanted to talk about the turtles for now :-)