Ah I'm such a fool, I had my mind caught up on traditional fighters that I almost forgot;
Min Min!
By far what I consider the best design in ARMS, and a generally fun, simple character to play, while also being just adapted into a crazy package of tricky stuff in Smash.
What I love about her is how she evokes some stellar iconography in both overt and subtle ways. The trick to really effective character design I've found is to really zero in on a certain associated imagery, then iterate upon it until it sticks in multiple corners. Min Min is associated with two things; ramen and dragon iconography. This blend of imagery reflects on her asymmetrical ARMS designs; one of her ARMS is composed of appendages resembling noodles, whereas her other transforms into a supercharged dragon. This gives her a wonderfully distinct half-and-half imagery which no other fighter in the cast has, and fittingly, it's actually evocative of how ARMS usually plays in practice as well - by mixing and matching ARMS loadouts of your choice. Yet Min Min is the only one who boasts this straight on the cover, and it makes her stand out among the crowd.
This iconography naturally also manifests in the surface design as well. On her shoulder, she carries narutomaki charms as embellishments. The logo that adorns her chest is the Chinese character "éşş" (men) which means noodle. You can even find this on the sole of her shoes, along with a dragon design, showing how the designers left no stone unturned in getting as much out of her traits as possible despite her easygoing design. Her sporty attire conveys her martial arts style. Even her hair resembles noodles, and her cool looking beanie resembles a ramen bowl. What I love about all that is how her details subconsciously contribute to how effectively the design comes together and makes you wonder how much of these well-thought out traits are responsible for that first impression. Orange/green is also a perfect color combo for her, though her alternate palettes deserve special credit for being so good that I almost never know which one I want to go with. All of this also helps contribute to her being one of the most animated characters in ARMS, being one of the few characters to employ kicks in combat and really opening up her mobility. Her down-to-earth personality of simply competing to support her family's restaurant is also just really admirable. In the ARMS universe she is the equivalent of a bad ass normal, and she's one of the most lovable characters because of it.
Easily perhaps my favorite fighting game character holistically. I had this character as my avatar for so long and I suspect I'll return to her soon.