Offline Player (Type) — Skript
Addon: Skript · Category: Type · Since: 2.0 beta 8 · Usage: parsing an offline player as a player (online) will return nothing (none), for that case you would need to parse as offlineplayer which only returns nothing (none) if player doesn't exist in minecraft databases (name not taken) otherwise it will return the player regardless of their online status.
Syntax
offlineplayerDescription
A player that is possibly offline. See player for more information. Please note that while all effects and conditions that require a player can be used with an offline player as well, they will not work if the player is not actually online.
Examples
set {_p} to "Notch" parsed as an offlineplayer # returns Notch even if they're offline