Let me just say that people bashing Dark Pit but defending Lucina are hypocrites. Hopefully, I won't need to elaborate on this any further.
But apparently Dark Pit is bad because "MUH RECOLOR MUH EDGY", but Lucina is okay because "MUH WAIFU".
I, for one, am I happy with the inclusion of both Dark Pit and Lucina in Smash.
Sasuke-type popularity is a good way to put it. Before dark pit was made his own character, I swear that black pit alt in brawl was created almost solely for fangirls to write fics about. 'Omg hes so edgy and dark. So cool.' Not.
The worst part is that his inclusion could have been forgiven. The sniper/staff looks cool. Why only use it for a final smash? I'm not asking for a completely new moveset here. Just a slightly different neutral special and forward smash or something. I mean, Dr Mario is likely to have a different neutral and down special.. I dunno. I would shut up if dark pit used his rifle for anything other than his final smash.
I'm just unable to rationalize why dark pit would get his own slot over alph, who is actually a different character, instead of just a what is essentially just a pallete swap, like dark link. Literally the only way I can make sense of it is calling out sakurai for being biased.
Dark Pit IS his own character, though. His similarities with Pit are just fighting style and appearance. He does have a different personality and motivations in Uprising's story.
Dark Pit and Lucina were at some point in the same boat as Alph, but got tweaked to become different characters because developers had enough time to do so.
Yes, Alph could have been a clone like Lucina and Dark Pit, but the latter two are more marketable due to being more popular, especially in Japan.