You know, still baffled I haven't gotten into an argument about why or why not 2B could be in Smash, even before we found out when DLC would be decided.
Just about the only thing going against her inclusion is that she has yet to dip her toes in the Nintendocean like Cloud has, but other than that, she's incredibly popular and appealing, so people wouldn't mind see her break the trend. Besides, with recent talks of Katalina – who's in a similar situation, but very much
The Scrappy at this point for her gacha origins – 2B seems vastly more preferable to have in Smash. Hell, she's in my Most-Wanted list of characters too! It helps that Yoko Taro has gone on record stating that he would love to have NieR: Automata ported to the Switch, which would then solidify 2B's place, but that's besides all the other flags that are in her favor.
How? Mage isn't really a fighting game archetype. Three Miis we have are, though: Close, medium, long range combat.
I will answer your question with another question: How is it
not a fighting game archetype? There's Zelda, Robin, Dr. Strange, Nine the Phantom, Tessa, Kan-Ra, etc. They can definitely work. As for why they're a popular request, it's simple: Refer to the lineup of Mii Fighter archetypes, then try to round them up in a 4-player or 8-player setting. No matter what you try to do, one archetype is always going to have a dominant presence in the selection. In other words, it feels incomplete.
With a Mage Fighter, you can even things out in 4-player matches by selecting one of each, filling all slots. For 8-player, you can do a 2v2v2v2 setup with no single archetype greatly overshadowing the others (or being underrepresented in the selection step), and you can definitely work out the ranges of each one. The Mage would be somewhere in between the Swordfighter and the Gunner in terms of range. Speaking of which, the Swordfighter's range is just paltry in general and barely any different from the Brawler, so the range argument is kinda moot.
But why stop there, right? Just some ideas for a Mage Fighter's lineup of costumes:
-Robin (duhh)
-Zelda (double duhh)
-Yuga
-Vaati
-Viridi
-Ashley
-Melia
-Sypha
-Black Mage
-Estelle
The list goes on.