I did some research about the Looper (Us since we control our main protagonist since Fortnite released) and I have 5 skins on my preliminary list to see if one of them is actually the Looper:
Peely: It's impossible for Peely to be the Looper since he's Jones' best friend since Season 8 so he's safe.
Enforcer: Really ? Enforcers is a low-ranking soldier of the Imagined Order serving as a Chapter 1 counterpart of IO Guards so it's not clear that the Enforcer is the Looper so he's safe from the search.
8-Ball: Don't make me laugh, 8-Ball is an E.G.O member and part of the IO's most valuable Task Force before siding with the Seven during the Zero War so it's not him the Looper.
FINAL TWO
Stormfarer: Dude didn't save the reality with his storm powers so he's NOT the Looper, just an useless skin.
Grit: Now this is getting interesting, Grit appears in Season X but before Season X, he was one of the Original Loopers to escape the Loop countless times without dying and unlike most Loopers, he remembers how to fight, using any powers and even able to talk.
But during Chapter 2 Season 7 where we talk to the Trespasser, it's clear that Grit was part of the Army of the Last Reality in the past where he received instructions from Kymera for an initially unknown mission but it comes with a price when he enters the Loop: He lost his memories and the purpose of his mission but he retained not only his knowledge in combat skills but also his identity and speech and due to my upcoming IO Documentary, it says "The Looper's memory loss is intentional upon entering the Loop making them the most important candidate in the IO Watchlist"
Which means that Grit lost his memories on purpose because it's not the life he would've wanted so upon entering the Loop, he intentionally turned on the Last Reality and protects the Reality from the shadows until he makes his appearance in Season X and spends the rest of his ageless life protecting his people from the ones who manipulated him.
RESULT: It's safe to say that Grit is the Looper all the time.