Characters involved in a "time loop" (who can be paradoxes also). There is many kind of time loops, a few examples involving:
Traditionally in the Marvel Universe, time travel influencing the past is supposed to create divergent realities.[6] Time is mutable in some circumstances, however, if the changes are too minor to trigger a divergence.[7] And sometimes time travel creates inevitable changes to history.[8][9][10]
  1. Marvel Zombies Return #5
  2. X-Factor #259
  3. Uncanny X-Men #512
  4. Further Adventures of Cyclops and Phoenix #4
  5. Night Thrasher #12
  6. Marvel Two-In-One #50
  7. Fantastic Four #553
  8. West Coast Avengers Vol 2 #18-23
  9. Gambit Vol 3 #12-14
  10. Blade: The Vampire Hunter Vol 6 #2