Love this mod. Always good to see IDW characters in games, her abilities are interesting and give her a unique middle ground between shooter and platformer, and her sprites are good. And after playing most of Metroid Vanguard, I loaded her up in first person for an extended period of time and that's a whole different thing again.
I only have a couple of complaints. First, it kind of sucks that third person lock on doesn't aim her gun up and down, and between that and not being able to jump and shoot it makes hitting flying things without going first person pretty hard.
Second, and related to that, you already let her shoot with the Fire Normal button even in midair in Ringslinger, and I played around with it a little and it felt really good. Why can't she do that in single player? It would also help with flying things in third person, and even help a little with aiming quickly in first person. (As any Scout main in TF2 can tell you, sometimes with a fast character it's easier to "aim" by keeping your aim about where it is and moving.) (Also incredibly minor it would also let me go from First Person Samus to First Person Whisper without rebinding.) (Also maybe one of the custom buttons would be better for single player)
Still, probably my favorite character mod, or at least my favorite one that doesn't feel like a COMPLETELY different game. 5/5, outstanding, I had high hopes and this was even better than expected.