It's Beast-Thief or rather Beast-Thi as used in the game,
one of the nameless common chars:
https://wizardry.fasterthoughts.io/adventurers/anonymous-adventurers/details/Beast-Thi/
Can't figure out how tagging works here so feel free to delete this comment later.

rOiBeRhOtZeNpLoTz said in comment #2595018:

It's Beast-Thief or rather Beast-Thi as used in the game,
one of the nameless common chars:
https://wizardry.fasterthoughts.io/adventurers/anonymous-adventurers/details/Beast-Thi/
Can't figure out how tagging works here so feel free to delete this comment later.

@rOiBeRhOtZeNpLoTz No need to delete the comment. It's good to have that information on hand.

You can read howto:character to learn how to make character tags. The most important part is to type "char:" before the tag.