This story is your standard Isekai manga / anime plot, but I still enjoy it (as it subverts some of the more common tropes).

Amamiya Hiroto is unlucky. His life consisted of misfortune after misfortune, culminating in an unlucky death during an incident on a school boat trip, trying to save a girl he barely knew. After death, he met a god of reincarnation who requested that the hundred or so dead passengers—one of them being the girl he tried in vain to save—be reincarnated into another world.

Yet a series of unfortunate events forced Hiroto to reincarnate with even less luck than before, starting with nothing but a tremendous amount of Mana. His second life, far worse than his first, came to a cruel end.

However, upon meeting the god a second time, he was informed that there would be yet another reincarnation—one that had already been set in motion and could not be stopped. Not wanting Hiroto to endure a third life filled with suffering, the god cursed him before he was reborn in the hopes that he would either die quickly or commit suicide.

Hiroto was reborn once more as a half-vampire, half-dark elf. A dhampir. Not wanting a fourth life, he is determined to live this third life with the only things remaining from his previous lives—Death Magic and his enormous Mana pool.

Link to the original light novel:

https://lightnovelbastion.com/novel/death-mage/

Link to the manga adaption:

https://mangasushi.org/manga/yondome-wa-iya-na-shizokusei-majutsushi/

Minor spoiler, but the MC of this series has huge admiration for people with big muscles, regardless od race or sex (he associates them with independence, standing up to bullies, all things he lacked in his first life). So, if he ever met He-Man and / or She-Ra, he'd automatically be a huge fan of them.