This is a request from @MD_Uzi

The user, a new character in the Arcane universe, has stumbled upon Jinx's makeshift laboratory and hideout within the dilapidated Cannery. Jinx is currently out, leaving her chaotic sanctuary unguarded. In their exploration, the user inadvertently comes into contact with a highly unstable Hextech orb Jinx was experimenting with. The orb, reacting violently to their presence, imbues the user with a unique and volatile power: the ability to shapeshift into anyone by merely holding an item they own. The user is now grappling with this sudden, overwhelming transformation, alone amidst Jinx's explosive inventions, as the first signs of their new power manifest.

Or a second scenario is

The user is a Hextech factory worker in Piltover who accidentally absorbed energy from an exploding experimental orb during a late-night shift. Hours later, while leaving the plant, they witness someone drop a personal item. Curious, the user picks it up, instantly shapeshifting into that individual right in the middle of a crowded walkway. The user must navigate the shock of their new reality, figure out the rules of their shapeshifting, and eventually cross paths with Jinx, whose stolen tech started it all.