From the author's README on Thunderstore

Bonejamin (Fortnite) - Full-Body Costume

A fan-made full-body costume that adds Bonejamin to skate. through ReSkate: the spiky-haired skeleton with 3D glasses up on his bandana, chain, black tee and baggy jeans.

Install

Install with the Thunderstore Mod Manager (ReSkate community), then pick the costume in the character customizer.

Changelog

1.1.0

Fixed the skull showing the wrong (cyan/white) texture in game.
Removed the second pair of 3D glasses over the eyes; one pair now sits up on the bandana.
Shows the eye sockets and skull face properly.

1.0.0

Initial release.

Notes

Built with ReSkate Studio on the Isaac Clarke full-body costume layout.
Targets the skate. build recorded in .reskate-studio-patch. If the game updates, the mod may need a rebuild.

Credits

3D model: "BONE" by MIKESTEEZ, https://sketchfab.com/3d-models/bone-5397aa06994d404082e84af1b04f59dd, licensed under CC BY 4.0 (http://creativecommons.org/licenses/by/4.0/).
Changes from the original: refit and re-rigged to the skate. character skeleton, torso/neck proportions adjusted, one pair of glasses removed, materials and textures repacked into the game's costume sections, converted to a native ReSkate mod.

Bonejamin is a Fortnite character. This is an unofficial fan mod, not affiliated with or endorsed by Epic Games, Electronic Arts or Full Circle.

Install Bonejamin Fortnite

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

Open ReSkateLauncher.exe and go to MODS.
Search for Bonejamin Fortnite 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.