I was recently working on a TMNT variant of my own game (just for funsies). What makes it potentially suitable is that it plays a bit more like a wave defense game (static grid with reinforcements joining from edges), during the big fights and has simple locational damage to drive the funny narrative descriptions forward. It also provides just enough framework to convert magic into gadgets that it easily fits with the TMNT world.
It's free, 14 pages, easy to pick up.
Rulebook
https://codeberg.org/Crabsoft/words_of_power/releases/download/0.0.0/words_of_power.pdf
WIP TMNT Variant
https://website.crabsoft.download/quantum/settings/tmnt.txt