Ideas for Season 4
As we saw in season 2,clem meets Kenny in episode 2.So if Telltale would one to bring characters they can have this excuses:
1.Chet: We dont know what happened to him so we can assume clem to find him in a group(He is no attached with clem tho).
2.Hershel:Again we dont know what happened,but i can assume he teamed up with Chet (They know each other) and be kind of like Carver.
3.Glenn:Again,maybe they meet eachother.
4.Lilly:????(idk she left em so i dont assume a meet up).
5.Omid:Perhaps Omid got saved and after he abandoned them?.Thats why Christa is mad ?.He run off with the baby?.(PLS revive him is my favourite character or everyones).
5.Christa:I am pretty sure she could just ran off and after meet clem in season 4?.
6.Lee...:Its gonna sound crazy...but perhaps Clem didint kill him(she thought she did).Someone founded him almost turned.Healed him with meddicine(The bullet wound)(Bullet didint hit the brain).Perhaps a semi-cure for the bite?.So now she tries to find Clementine.For the time he has left.Maybe he is in a group with Glenn,Chet,Christa???.(PLS REVIVE HIM)
Thanks for reading(Hope someone from telltale did),sorry if this explainations sound retarded but i want some characters back 
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Comments
Glenn, Hershel, Omid, and Lee are all confirmed dead. Chet is determinant, so I doubt he'll return.
As for Christa and Lily, it's possible they might show up next season. Majority of the fan base prefer Christa showing up rather than Lily.
But perhaps they aint dead !Creepy music in the background
Hershel isnt dead
Yeah, he is. He dies in the comics when the prison is attacked.
And Glenn is killed by Negan in the comics.