Real talk: Thousands of players use custom skins every day. There are no confirmed reports of bans solely for using a Volibear custom skin in normal or ranked games. However, if you brag in All-Chat that you are using mods, you are inviting a manual report.
To use custom skins in League of Legends, you must use a community-accepted mod manager. The current industry standard is (managed via community platforms like Runeforge). Step-by-Step Installation Guide volibear custom skin
A hilarious take on Volibear's classic white bear aesthetic. This skin dresses him up in the iconic red scarf, replaces his lightning effects with exploding fizzy soda bubbles, and makes him drop a vending machine during his ultimate. Real talk: Thousands of players use custom skins every day