I Know Epic Martin Color theory is interesting and got stuff right, but I don't know if i can get behind CP11 using a green color. Pyra/Mythra already use Green, and I think at least within pass, they would make colors more separate.
I want to say Purple is the way to go from here, or some other interesting color like Sephiroth's more gray color
From Tekken 6 and onwards (and I think Tekken 5 maybe), you usually just customize the colors of the outfits to your liking
The previous games before usually was limited to alts, and like one Palette Swap. I wouldn't be worried about muted palettes since Namco allows the Tekken characters to already have crazy outfits and colors anyway in the home game
I mean to be honest, at this point, riling for any character can be considered wishful thinking. CP11 Speculation is gonna be the most Freeform speculation of the DLC, because alot of perceived barriers are cut down, and since this is the last character, it's unknown what's gonna happen. You should go all in at this point
The reason I was thinking Shadow was in a do or die situation for today was because considering it's the Anniversary of not only Sonic, but Specifically SA2 in like 3 days, I would think that if Shadow was actually in the pass, he'd be revealed now.
Thinking about it further, Pyra/Mythra were revealed after Sakurai had posted the Anniversary pic anyway, and plus I think perhaps Nintendo and/or Sega might see more benefit for announcing Shadow later, maybe to better coincide with Sonic release near fall.
Sakurai does like Edgy characters though, and it seems This pass is him expressing his love of Edge.