will Nintendo ever add Wario counterparts for Peach/Daisy?
They were going to, but Miyamoto told them not to. I'd be all for it, so we can keep Nintendo(keyword)from making redundant recolors and babies to fill the rosters out. DeviantART may have some Wapeach/Daisy mockups lying about.
Yoshi is female, Birdo is her boyfriend.
Not every character needs a Wa- counterpart. Mario is the protagonist, so the whole 'nasty doppelganger' thing makes sense. Waluigi's forgivable, since he completes the whole Mario-Wario duality by giving Wario his own Luigi, but we don't need Wapeach or Wadaisy. I think it would damage Wario's appeal by making him just one in an army of alternate counterparts, and it's a lazy way of introducing more characters. Eventually we'd have stupid shit like Wabowser, Watoad or fucking Wankey Kong.
As for Boshi (who's actually called Washi in Japan), he's from a single game that was released over 20 years ago and hasn't been referenced since. He barely counts. He fails as a Wario'd Yoshi anyway; Wario and Waluigi look like distasteful caricatures of the Mario Bros., with their defining features overemphasized and made to intentionally look shifty. Boshi is just blue Yoshi with sunglasses and some extra edge.
>also Яosalina, the Comminust version of Rosalina
No, Hylians are based on Tolkien elves. Takashi Tezuka was the story guy for the first Zelda game, and the reason he was pegged for the role was because he was a big fan of Western fantasy novels like Lord of the Rings.
Rosalina is evil Peach. It's why Rosa and Waluigi are a pair.