My nickname as a boy scout when I was 13 years old was "Guirash - Intrepid Puma", a name given to you by the scout leaders depending on your abilities and skills, so I guess there's that.
On the other hand, I used to think of myself as an Albatros.
But, on the realler of the reallest other hands, I was once nicknamed weasel when I was like 7 back when we were playing wild animals that are embarrasing so, I'll stick to weasel.