The protagonist is reborn beginning a new life as a baby/infant, attaining a new physical body and identity in the world. Includes Passage of Time, Age Progression, Second Chance, Reincarnation tag.
Second Chance from a Bad Ending in Fantasy Setting here
Complex Family Relationships/Found Family in fantasy/isekai here
Protagonist aims to protect lead character from bad endings in romance/fantasy here
The side character is the Regressor/Isekai, the protagonist is not. here
Country Building/Conquest/Seige in fantasy/isekai here
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Anilist Sync