Stand

"AAAAAAAAAAAAAAAAAAAAAAAAAAAAA BRUNO GIVE ME THE FUCKING ARROW"

A Stand is similar to a persona, except cooler and also not a demon. Probably.

A stand is a physical manifestation of the user's life force and a manifestation of their psyche.

For now, the only known stand user is Raidou Kuzunoha the XIV, although how he uses them is currently unknown. It's believed he somehow summons them like demons (Or maybe he trapped the stands users in the Kudas).

King Crimson
Kin Crimson's abilities include stopping time, being able to erase time leaving only the results but not the in-between (Don't ask how it works, it just does), and seeing time in advance. (Or it's just whatever kind of bullshit Araki wants him to do)

Season 3
Strange things happened on Majima and Walter 's match on Season 3 Episode 7, while Majima had the higher hand before, these strange events turned the match around. These events included time slowing down to practically stopping, and the time between Walter beginning his Finisher and the aftermath being erased.

It's believed KC may have been summoned as a demon by an avid Devil Summoner who may have an alliance with another Chaos aligned. Though there's also the other possibility that it was summoned by it's stand user, Diavolo.

Mandom
A stand who can rewind time a certain amount of time,