Echoing jcalder8 a bit, but...
Castlevania - Sign me up for a series of 2D side-scrollers in 1080p60 kthx. Every 3D Castlevania I've played feels absolutely soulless.
Final Fantasy - I crave more mature storylines, believeable characters, and pithy dialog. Work off VI, VII, IX, and XII for inspiration, ditch Nomura, and keep the development team small, focused, and collaborative.
King of Fighters - Falcoon's artistic legacy lingers way too strongly for my tastes. Ditch all this Ash Crimson crap.
Metal Slug - I'd love to see something more along the lines of Contra: Shattered Soldier or Moon Diver.
Metroid - Controversial choice maybe, but I crave the classic mechanics and atmosphere on a console.
Resident Evil - It's really not that hard to evoke the classic feel while still creating something fresh and interesting, provided the developers understand what made it work to begin with. I liked RE6, but outside of Leon's campaign, it might as well have been a different series.
I've tried to avoid going into series I want to see simply revived, but insert obligatory mention of Shadow Hearts and Legend of Dragoon here.