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
Golden Contribution - Winter Update 2024 contestNovember 24, 2024
Brighid Grand Explorateur - Applying to TibiaQA team as ModeratorNovember 19, 2024
Looking for new TibiaQA staff membersJuly 12, 2024