Akiharu "Haru" Minase

Akiharu Minase (水無瀬 明春), also known by his nickname Haru (ハル), is a main character in Digimon Survive. When he meets the children, he suffers from memory issues and so introduces himself as Professor (教授) rather than with his real name. He eventually remembers his real name, though even after the children learn it — they still refer to him as Professor.

Appearance
As an old man, Ahkiharu has grey hair, amber eyes, and a beard. He wears a white hat, a white collared shirt with buttons, a blue sweater vest, a black blazer, grey pants, and black and red sneakers. He also owns a pair of black glasses, though he doesn't always wear them.

Description
The Professor teaches folklore at a university. He has a unique perspective on folklore and wrote his on them. His papers have been treated as heresy by multiple academic societies. He is extremely curious about other worlds and monsters.

Etymologies

 * Akiharu Minase (水無瀬 明春)

Nickname used in Digimon Survive.
 * Haru (ハル)
 * Ja: Haru (ハル). Haru is short for Akiharu (明春).

Fiction
In 1970, 50 years in the past (thousands of years in alternate world time), Akiharu and his sister Miyuki Minase were transported to the alternate world. Akiharu became partner to, with the two becoming the best of friends. Gabumon wasn't very strong though, which lead to Akiharu protecting him instead of the other way round. Feeling pathetic about how weak he was, his desire to protect Akiharu causes him to evolve to. Before it can protect him from the Kenzoku, though, the duo are separated when Miyuki sings the song of the Minase Maiden, which sucks him into a portal and sends him back to the human world. Garurumon freaks out, with him thinking their bond was just a lie the entire time, which causes him to hate humans and start sacrificing them over the course of thouands of years (50 years in human world time).

Akiharu spends 50 years separated form his sister and Garurumon (thousands of years in alternate world time), and dedicates his life to studying the Kemonogami. He becomes a Professor, teaches folklore at a university, and becomes a published author — writing a book named The Kemonogami Legend.

He eventually ends up being transported to the alternate world once again, and comes across Takuma Momozuka and his friends, becoming part of the group trying to return home. Miyuki and were part of the group, with Akiharu confused since they looked exactly like he and his sister did when they were younger.