hmmm, if we're doing wish lists by series here is my list of characters that'll never get made.
Naruto:
Shikamaru: he really is the greatest Ninja of the leaf and he doesn't even need a damn tailed beast or kekkei genkai to do it
Shino: sadly didn't get to do too much, but always thought he looked cool and the bugs could make for a heck of a display.
Kisame: the coolest looking member of akatsuki
One Piece:
Buggy: The greatest character in the series and the man truly destined to be King of the Pirates!
Kaku: I just always enjoyed him, the Water 7 arc was one of my favorites and he was the best character from it.
Fujitora: I've always loved the blind swordsman archetype and it's always nice to see a Marine that isn't a total dick.
Hachi: I just think he'd be awesome looking
Bleach:
Yamamoto: again just always a fan of the whole "ancient master" thing. and he'd make an awesome piece all covered in flame.
Gin: always found him to be a really interesting character, shame he didn't get a chance to better redeem himself from the Aizen mess.
Uryu: my favorite character in the series, granted he's a bit boring looking but i'll make an exception for him.
Dragon Ball:
Piccolo: hopefully in his full Cape & Turban.
Guldo: love that little 4 eyed bastard, coolest member of the Ginyu force and the best character to come out of the Freiza saga.
Pikkon: what can I say the green characters are the coolest in DBZ. double points if West Kai can come with him
and there you have it, my list of characters who don't have a shot in hell of getting made, aside from Piccolo of course.