More than one person (including the protagonist) is transported, reincarnated, or transmigrated to another world. Includes Group Isekai/Class Isekai. Also Transportation, Reincarnation, Transmigration. Note: this list may hint future character identities in a series.
(PART 1) { RIGHT NOW }
(PART 2) here
(PART 3) here
Additional List:
Protagonist falls into an Otome Game/Eroge/Game world here (Female Protagonist) here (Male Protagonist)
Protagonist was thrown into a Novel/Book world here (Female Protagonist) here (Male Protagonist)
The side character is the Regressor/Isekai, the protagonist is not. here
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