Simple question. Say we got a new Limited character every year, whether they were only featured at Anniversary (Dino) or had special circumstances for acquiring their covers (Howard).
What characters would you like to see Limited, as opposed to freely available like normal characters?
Paste Pot Pete.
Hypno Hustler.
Don’t care as long as they come with the amount of hp someone needs to roster them.
Oh and it isn’t too late to make Jubilee limited either. 
I don’t like the way Limited characters are introduced, and I think it lends toward useless sideshow characters. Since they by definition can’t be regularly rewarded, they have to be boosted/required rarely (if ever), and even when they ARE boosted/required, they’re going to be low-cover so poorly developed by most of the playerbase.
They can’t be too strong, or players that miss the limited window to receive covers are at a disadvantage above and beyond the general “started playing later” disadvantage. If they’re not pretty strong, people won’t use them, so… I get to a “what’s the point” place pretty quickly when discussing them.
Stan Lee
off-topic comments removed
In all seriousness I’m not a big fan of limited characters and not super excited to see a new one. As such I have no interest in suggesting/encouraging the devs to do more of them.
*mod note: off-topic comments were removed and warning issued. - fight4thedream
Conan
G.I. Joe
Transformers
Spider-Ham
Any Star Wars character
Franklin Richards
Valeria Von Doom
This!!! ^
He could be the ultimate 5* limited character that wins everything. LOL!
For myself, I would love to see a 3* character, one available semi-frequently, like Howard.
I want really jokey characters
Stiltman
Flatman
That cartoony Batmite version of Wolverine in the Exiles
Their character slots should be discounted, or even free.
None. I hate that they are limited. I never liked that Dino was a limited release. They need to release them all into the Wild and let us use them.
Spiderham, frog thor. Bring me more silly stuff. Ooooooo Slapstick!
Bessie the Hellcow, Doop, Forbush Man.
Clump and Trinton, conjugal avatars of the Tao.
Golden Oldie.
We have Dazzler, so now my fixation has moved to Golden Oldie.
If they ever come up with some new villains for PVE, like the Masters of Evil or the Frightful Four, I’ve thought they should either be NPCs like Gorgon and Ultron, or limited 1*s like Yelena.
Also, Howard’s rogues gallery. The Kidney Lady was winning every single confrontation she was in before anybody heard of Squirrel Girl.
I forgot about Doop from my days playing Marvel Heroes.
Hydra Bob
I’m going to put this out there and agree that Taskmaster should be limited.
I’m having a slow week and just realised how the character development is supposed to function: he could be given any power from any future character so next time he comes around for a boost he could get a Cable power cover or from someone else entirely to add to his armoury.
That’s a new cover which, alongside standard champ rewards, is worth hoping and waiting for.