Tretista Kelverian, the Chief Judge or the Dark Judge of Pain Judgemet, a member of the Eight Gentle Judges, later known as the Weil’s Numbers.
Recommended Weights are: 1.0-1.5 (I found it to be more accurate towards 1.5)
Also, I recommend using 'IL Megaman Zero Style Character Design' LoRA by Chamber if you want to make his appearance to that of the game. (Half of the showcase images were made with that LoRA)
https://civitai.com/models/1055741/il-megaman-zero-style-character-design