From the author's README on Thunderstore

Lucia (GTA VI) Costume

Play as Lucia from Grand Theft Auto VI in ReSkate.

This is a full-body costume. The Crash Test Dummy is used as the base model.

Installation

Install in ReSkate/mods.

Credits

Lucia model and textures: "Lucia (GTA VI)" by MrUncleBingo, from DeviantArt, based on Grand Theft Auto VI (Rockstar Games). Grand Theft Auto, GTA VI and Lucia are trademarks of Rockstar Games / Take-Two Interactive. This is a free, non-commercial fan mod, not affiliated with or endorsed by Rockstar Games or Take-Two Interactive. It will be removed on request from the rights holders. Edited (hair simplified, clothing fitted) and fitted to the ReSkate skater rig, built with ReSkate Studio. Built with AI assistance (Claude).

Install Lucia Caminos

You need ReSkate and your own copy of skate. on Steam.

Open ReSkateLauncher.exe and go to MODS.
Search for Lucia Caminos and click install. The launcher also installs anything it depends on.
Press PLAY. In game, the MODS tab of the ReSkate menu (Insert) turns it on and off.

Or install it by hand: download the .zip and drop it on the launcher window, or unzip it into its own folder in Mods\ beside Skate.exe.

Maps show up in the ReSkate menu's level list. To join a server running a custom map, you need the same map installed. If the game won't load after installing, see known issues.

skatemods doesn't host or review this mod. The download comes straight from Thunderstore. Only install mods you trust, because scripts can run code.