The Anime Lad
After completing a long career, an elderly assassin meets a goddess offering reincarnation. She sends him to a fantasy world with a specific mission involving its future Hero. Reborn as Lugh into a noble house that practices assassination, he begins training with memories intact. Childhood now includes magic lessons and unusually advanced performance reviews.
Super Eyepatch Fox
A master assassin receives a second life in a magical world and one divine assignment: prepare to kill a prophesied Hero before disaster follows. Reborn as aristocrat Lugh, he combines modern professional knowledge with his family's secret craft. The series treats magical training as practical logistics, making reincarnation feel like a planned operation instead of an accidental vacation.
Gigguku
This man gets magic and immediately starts measuring it like laboratory equipment! Lugh's old expertise turns every childhood lesson into a field test, while his new family provides a whole fantasy tradition of covert work. The goddess's assignment hangs over the setup, but the real hook is watching disciplined knowledge collide with a completely different system. He is min-maxing competence with terrifying sincerity.
Father's Basement
The overqualified reincarnated protagonist is familiar, and the series is not shy about arranging admiration around him. Its saving distinction is process. Lugh tests assumptions, studies local techniques, and treats magical talent as something requiring controlled practice. The divine mission also gives his power accumulation a concrete purpose from the beginning, even if the premise remains unapologetically engineered for competence fantasy.