Hmm, this is an interesting thread. I think most of the new characters post UMK 3 should die forever... be thrown in a meat grinder and fed to Kintaro.
*MK:A - Taven and Daegon. These two are incredibly forgettable. Who needs to die? Both of them
Every new character in Mortal Kombat Deception, except Ashrah. Ashrah is pretty unique and I like her style. I would LOVE to see her as a DLC at a future date. I think Deception has the WORST roster of new characters I have ever seen. I can't even remember most of them, as they were mostly generic and forgettable. Kira and Kobra are the only ones I can even remember from this bunch, and I hate both of them.
MK
A - Hated Mokap, and Blaze did nothing for me. I really hated Bo Rai Cho. I didn't think he was funny, and he was gross to look at. He was a waste of a character spot that could have gone to... I dunno... Mileena?
MK4 - I actually like Jarek, so I don't understand the hate for him. He is kind of amusing, albeit a total Kano clone. Reiko was okay, but felt rushed. Fujin, Tanya, and Kai were forgettable, and they could die forever, and I doubt I would not miss them. Shinnok was a joke... no original moves (although his fatalities were good). He needs to die.
MK3 - I would have said Stryker needed to die before MK9, but this game redeemed him in a BIG way. He is really good now, and I think he should stay. Don't care for Sheeva much.
MK 2 - A great roster of newbies. Only Shang Tsung is kinda meh as a playable character, and I think he has just gotten worse as time has gone on.
MK1 - Liu Kang is too generic, and Kano never really grew on me.