Long time lurker first time successful joiner (had some issues last time and didn't try again for a few months.
I read through the first 15 or so pages but I figure any repeated info won't be too hurtful.
The added costumes is a great thing in my opinion and showing the game to other people I usuallynote the costumes the most as they are the most strikingly new things (koopa squirtle and shiny charizard for instance)... other than the classic stages and what not. And having more, particularly drastically different costumes is a real nice one.
As I typed this I thought of my avatar with Youngster Joey in it and how that'd be a hilarious alt costume but Pokemon Trainer is no longer in the game so nvm that!
For Yoshi I could suggest baby style yoshi with hair from TYD.
It'd be great if he had alt voices where he actually spoke and said things like "check it out Gonzalez!" of course I'm mostly joking on that front still the change could be cool... perhaps making that baby yoshi full sized would make the diaper and spiky hair a bit weird though. I was trying to remember what that particular Yoshi is called and the name "Yoshua" came to mind but then I remembered that's just what I personally named him in game.
I see a lot of suggestions for a Young Link costume for Toon Link... but that seems a little haphazard what with the body differences... would anyone be open for Toon Link wearing a young link costume? Maybe holding his mirror shield with scary face and guilded sword? Could be cool. Toon Link already has a costume based on classic link and it'd be pretty par for the course I think. I would think there would be pictures of it online but I might have to make up a mock-up in a bit to show you what I mean... if it isn't obvious.
Kirby just needs more colours. a grey, purple, gold maybe?
Pikachu and Jigglypuff could just do with more hats. Like give them both all the trainer hats from each gen or at least the first 3 gens.
Dr. Luigi anyone? lol jk.
pokemon like Squirtle/Ivysaur/Charizard could maybe have classic looks? Sort of like how Kirby has his classic box art Monochrome look?
They could go for a classic Red/Blue Gameboy coloursheme... a lot of whites and a single other colour.
I think these could be very striking looks without much effort really. Just a thought I realise we are looking more at new alt costumes rather than recolours but I feel some characters don't really lend themselves to costumes as much... unless you want to give these three (and lucario) some hats... which I would not be opposed to.
I saw some people saying Scourge for Sonic, which is a pretty good idea honestly... or at least Anti-Sonic who is just sonic in a leather jacket with sunglasses.
I can't think of much for Nana/Popo other than new colours. Though having them decked out in summer clothes would be pretty funny. Hawaiian shirts and sandals anyone?