Y
- The Yancy Street Gang in Fantastic Four #11
- Yellow Claw
- in Marvel predecessor Atlas Comics: Yellow Claw #1
- as telepathic "voice" in Strange Tales #160
- as robot in Strange Tales #161
- Yellowjacket
- as Henry Pym in Avengers #59, December 1968
- as Rita DeMara (villain) in Avengers #264
- Yukio in Wolverine #2
Read more about this topic: List Of First Appearances In Marvel Comics Publications