Gravity falls : I am … Stan pines !
Synopsis: After a completely wild night out, a young man dies while driving drunk and ends up waking up as Stan Pines in Gravity Falls, without any logical explanation.
Author's note: The cover is not mine, and Gravity Falls doesn't belong to me either.
This is a harem story, but there's no pedophilia or incest here, and he won't actively seek out waifus. I'd also like to specify that the protagonist is of the heroic type (but not stupid, and he'll sometimes be a jerk).
Small note: This is a crossover with "Inside Job", The Owl House, Amphibia, and Star vs. The Forces of Evil (not sure about the last one, but we'll see). Keep in mind that the multiverse is possible