But apparently they sell this bullshit in Walgreens. I heard about this thing. But wasn't it some YouTube craze or something? I mean what the hell is this? My kids laughed and would say this phase couple years ago, but didn't think it was mainstream enough to warrant this.
Lots of the assets (most notably face models) are from Half-Life 2. The reason they've been used in this skibidi shit is because the original videos were made with either gmod or Source Film Maker, not sure, but in any case, in the Source engine.
And of course the easiest way to find models for this is to take them from Source games. If you just started playing with gmod, that's probably what you'd be doing, building silly stuff with assets from your source games.