Remember that old 5ch rumor mainly with Velvet? Well I definitely think the guy has legitimate sources now. He only believed Hero, but he also said Erdrick's armor and Slime Hat were mii costumes which ended up true.
And he also figured Lloyd and Yuri were Mii costumes and considering the new mii costumes were only from the same series as the DLC Fighter so far, it lines up. and the guy said that 8 sources heard it was someone from Tales. Along with some Insiders we know of here hearing Lloyd and Yuri.
But the suspicious part is the Resident Evil and Nakoruru part. Only 4 sources heard these two. But there's three spots left. So I think it's:
1.Just one of these two(might be Jill for RE if it corrsponds to the Fighting Female rumor)
2. One of them being a bonus character to purchase
3. Just not legitimate at all.
Like the 5ch guy himself said, he was only confident in Hero. But it seems like Tales is the most likely for the one of the last two based on Insider info right now.
But if Banjo only comes with Microsoft Mii Costumes, then no doubt to me that the last two DLC characters are Namco and Capcom(aka Tales and Resident Evil), while there could be Mii Costumes outside of character releases, so far the only major non-character patch briught no mii costumes which implies only 5 waves of Mii Costumes.