Fighting mermaid

After SapphiraVolkov suggested me a betta fish when I asked which fish I could be, I thought this fish would perfectly suits a friend of mine.
We're doing karate together since years, she helped me to get my black belt, she's a kind of tomboy but is also girly. She was my best man (What's the feminine equivalent? Can't find it) and she was the very first one to guess I was pregnant (Even before I did). So I did that for her. Just like that because I wanted to make her happy.
Also, fun fact: she owned a betta fish during three years ^^ (I didn't know it)

Waves are, again, inspired by nati works
First "#mermay" done here: fav.me/dbc35nf