Same story as it was for Thermite, I came up with her design way back in 2019. And then somewhere down the line I thought of her instead of being an average fish person, I leaned more towards her having one arm because I thought it look cool. Along with her being a {mentally} insane engineer.

Update: so, I changed her name to Myrawatt and Tazey is just a nickname given to her from her friends, and now she a unhinged engineer with a heart of gold.