Yes, you can assing it to any of your characters.
Mounts or outfits purchased with Tournament Coins are available for all characters on the account, including future ones. They can also be used if an account loses its Premium status.
Source: Tibia.com Manual - Tournaments
Question Revival VI contestMarch 16, 2025
Looking for new TibiaQA staff membersJuly 12, 2024
Interview with Solkrin - lead of the Customer Support team at CipSoftDecember 20, 2023