The method :
1. Using Ristarte portal
2. Dead and reincarnated
Here the possibilities :
1. Medaka Box verse
2. Cardinal world (Tensura) - (?)
3. Bleach verse
4. Jobless reincarnation verse
5. Goblin slayer verse
6. Tortus (Arifureta) verse
7. Gintama verse
8. Fairy Tail verse
9. Toaru verse (using Toaru Majutsu no Index : Imaginary Fest for referece)
10. Danmachi verse
11. Majo no tabitabi verse
12. Konosuba verse
13. Re:zero verse
14. No game no life(?) verse
15. Iruma-kun verse
16. Overlord verse
17. Yojou Senki verse
18. The rising of shield hero verse
19. One Punch Man verse
20. The World's Finest assassin verse
21. Megaman series
22. Sonic(?) verse
23. Princess Connect:Re Dive! verse
24. Fullmetal Alchemist verse
25. Fate verse
26. Honkai Impact verse
27. Touhou verse
etc (i'll add something later)
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LIBRARY - Character crossovers
Science FictionWhat will these characters do for their crossover journeys