Bebop

When two of pop culture's most beloved universes collide, you need the right kind of chaos to make it sing — and Bebop delivers exactly that. Debuting in 2016's Batman / Teenage Mutant Ninja Turtles Adventures #2, courtesy of Matthew K. Manning and Jon Sommariva, this Modern Age troublemaker stomps through IDW's wildly fun crossover alongside heavy hitters like The Joker, Rocksteady, and the four brothers themselves. It's a compact but gloriously unhinged corner of comics history, and for fans who love their crossovers loud and their rosters packed with personality, Bebop's presence in this mashup is exactly the kind of detail that makes a collection feel complete.