I still think folks are looking at the wrong things when considering how different certain characters are, or how similar they are. Aesthetics are important, yes. But when you're playing a video game like Smash, there's far, far more than how a character looks, or what game they come from.
The conversation has now come down to Ryu Hayabusa looking similar to Doom Slayer. They might have similar coloring or appearance, but let's be real...it's not like you could confuse Ryu Hayabusa with Doom Slayer. It's not a thing. They look so entirely different there's just simply no way one could confuse them.
One is a ninja, the other is a marine. Those are two entirely different "career choices", if you will. They might both be involved in killing things/people, but the "what" isn't what we should be focused on. It's how they do the what that should be the focal point.
This is similar to the "anime swordsman" argument that we all love so much. The "anime swordsman" argument is a surface level point that doesn't get past what game a character comes from, or what they look like. Some folks have mentioned Fire Emblem having too many characters, or that to some, they have become "indistinguishable". I mean...I'm not really sure how one could confuse Marth with Ike, even if they have the same hair color, but to each their own I guess.
Marth and Ike, for example, both use swords. The Falchion and Ragnell, however, are different types of swords, and therefore at even that level, cannot be used the same way. The "what' being the class of Sword User, in itself has deviations. As the player, you frankly can't play Marth the same way you would attempt to play Ike. The "how" the way you play the character to succeed, is so drastically different. Marth strives for the tipper with Falchion, while Ike wants to bait his opponent into a strong punish, or juggle with nair. This is why the "how" is so much more important than "what".
Basically, we should be asking, "How does "X" use do "what" differently from the other characters who do the "what"? That's literally the question. If you insert a character and say, "How does Link use his sword differently from Cloud?". The answer is obvious. "How does Roy use his sword differently from Chrom?" The answer to this is murkier, but still easily answered. Again, it comes down to archetype as well as moveset.
Maybe I care too much, but it kills me when folks completely disregard the fact that we LITERALLY PLAY Smash Bros. You can stare at it all day, but it's meant to be played.