Yugi: Alakazam (Closest thing I could think of to Dark Magician)
Kaiba: Hydreigon (I think he fused his Blue Eyes' into a 3 headed one at some point but I could be wrong)
Sasuke: Arbok or Seviper
Fortuneteller Baba: Alolan Meowth (Dressed like a witch)
Joker: Blacephalon (Clown thing)
Master...
Krillin gave up martial arts after Cell Games and Tien never stopped training. He also spent time w/o a body after Freeza killed him so no afterlife training. He might have passed Tien after the potential unlock but eventually he caught back up and passed him again.
That's my head cannon at...