I'm mostly into Disney and Batman villains, so, my list mostly concentrates on those two things...
More than anything else, I want to see a POP of JUDGE CLAUDE FROLLO from Disney's The Hunchback of Notre Dame. He is not only my all-time favorite Disney Villain, he's my all-time favorite villain, period. I love the guy to pieces. My other favorite character is Jafar and since we got him in Series 5, I really, really want a Frollo to match.
My dream would be that Funko would do a Hunchback Set of 4, with Frollo, Quasimodo, Esmeralda and Clopin. But I wouldn't be against Frollo getting in as part of a Villain series or what have you.
The character I'd like to see most after Frollo is GASTON from Disney's Beauty and the Beast. Again, I love this guy. And it just wouldn't do to have the rest of the main cast and NOT have the villain, would it?
Even though it will probably never happen, after Gaston, I'd want PROFESSOR RATIGAN from The Great Mouse Detective. As you can see from my user name, I love this character. And he never gets ANY merchandise or representation. It'd be nice to see him get something. He deserves it.
In addition to those, I want to see THE HAG from Disney's Snow White & the Seven Dwarfs.
HONEST JOHN & GIDEON, the Fox and the Cat, from Disney's Pinocchio.
LADY TREMAINE, the Evil Stepmother, from Disney's Cinderella.
The QUEEN OF HEARTS from Disney's Alice in Wonderland. (The animated classic. NOT the Tim Burton film.)
SHERE KHAN the tiger from Disney's The Jungle Book.
SIR HISS from Disney's Robin Hood.
MADAME MEDUSA from Disney's The Rescuers.
THE HORNED KING from Disney's The Black Cauldron.
SCAR from Disney's The Lion King.
HADES from Disney's Hercules.
YZMA from Disney's The Emperor's New Groove.
KRONK from Disney's The Emperor's New Groove.
DR. FACILIER from Disney's The Princess and the Frog.
As for non-villains, I'd like to see TIMOTHY MOUSE from Disney's Dumbo.
BERNARD & MISS BIANCA from Disney's THE RESCUERS.
BASIL OF BAKER STREET from Disney's The Great Mouse Detective (seems like I have a thing for animated mice, doesn't it?

).
The aforementioned HUNCHBACK characters.
HERCULES and MEGARA from Disney's Hercules.
KUZCO from Disney's The Emperor's New Groove
and LILO from Disney's Lilo & Stitch.
And that pretty much rounds out my Disney wish list.
As for DC, I'd like to see a BATMAN: THE ANIMATED SERIES set. Pretty much ALL the main heroes and rogues. But most especially:
(Unless otherwise noted, the original designs for the characters, before it became The New Batman Adventures, are the ones I prefer.)
TWO-FACE
THE RIDDLER
MR. FREEZE
THE SCARECROW (In his second design. The one that resembled a Jack-o-Lantern. NOT the hanged corpse look from TNBA)
THE JOKER
THE PENGUIN
THE MAD HATTER
CLAYFACE
I'd like to see a Frank Gorshin RIDDLER from the Adam West series. One in his standard tights, another in the rarer seen green suit & bowler hat. (The latter is the one I'd want most, honestly.)
I'd like to see a TIM BURTON'S BATMAN series with Michael Keaton BATMAN, Jack Nicholson JOKER, BOB THE GOON, Michelle Pfeiffer's CATWOMAN and, most especially, Danny DeVito's PENGUIN. Maybe even Christopher Walkin's MAX SCHRECK.
I'd like to see the comic book versions of PROFESSOR HUGO STRANGE (Brian Bolland's design), THE RIDDLER (Jim Lee's design), SCARECROW (Alex Ross's design), THE PENGUIN (Brian Bolland's design) and Two-Face (Neal Adam's design).
I also wouldn't mind seeing Christopher Nolan's SCARECROW from Batman Begins.
Other DC Characters:
BIZARRO SUPERMAN
BRAINIAC
MR. MXYZPTLK
Ooh, and, before I forget, RITA REPULSA from the Power Rangers would be delightful. And how about HIM and MOJO JOJO from POWERPUFF GIRLS? Also: SAIYAN SAGA VEGETA (w/ red scouter and tail) and GARLIC JR. from Dragon Ball Z.
...I guess that's it for now.

I may have went a bit overboard. But this IS a dream list, right?