Both. I definitely want new characters to be introduced so that MK can keep moving forward. But I don't want future installments to be overloaded with a crappy batch of "new" characters ala Deadly Alliance and Deception. Also, keep the klassic characters. They could switch up how much emphasis is put on the established characters' stories in each story; for example, Sub-Zero may be more prominent in MK10's story, and then in MK11, Smoke might be more an important character.
I would also like for some MK4 and Deception characters with potential to be given the Stryker/Nightwolf treatments and be more fully fleshed out. Characters like Reiko, Tanya, Ashrah, Fujin (he is already pretty well-liked), Kai, Li Mei and Havik (see Fujin) can be revamped and become what most of the MK3 characters are now; characters who weren't given enough attention in the past but are now great because more attention was indeed given to them. But there aren't many post-Trilogy characters that have potential and most of them just need to be axed completely. Kira, Kobra, Hsu Hao, Nitara, Moloch, Drahmin, Taven, Daegon, Blaze, Jarek, and Mavado are examples of post-Trilogy characters that I think need to stay in the past. Sheeva, too, is a character I think should be getting a pink slip from the MKverse; she is never really liked in any game she appears in and Sheeva doesn't have much if any reason to be in the story anyway; the only reason people really want her is because fans back in the day wanted a playable Shokan, and Sheeva was the answer for that. We don't really need a playable Shokan now. She has nostalgiac value, yes, but if there was one well-known klassic character that the MK team would ever get rid of, it would definitely be Sheeva.
I disagree, we need a shokan or a huge guy equivalent. Because the one thing that Mortal Kombat is lacking is your Zangeif's/Tagers/Ganondorfs ect ect.
Your grapplers/HUGE hitters.
Guy that will kill you if you let him grab you more than 4-5 times. Does huge damage, but is slow as a turtle can't dash(or can dash but can't jump) Uses meter for armor. Ect ect. Sheeva is the closest thing we got to that so far. We need a character like this. Doesn't have to be shokan, but i'd rather have her in, than to get rid of her and not replace her witha grappler type character.