Beside this, who does Peyton end up with iZombie?
The now fully human Ravi and Peyton were married and happy, although it doesn't sound like there are kids for these two (and I respect that decision for them to focus on careers instead). Ravi was the head of the CDC and Peyton the D.A. of Atlanta.
Furthermore, do Blaine and Liv get together? Seeing a distraught Peyton discover that Blaine was the one who made Liv a zombie was difficult. Luckily, they were together when he was given a zombie cure.
In this manner, do Ravi and Peyton get together?
Peyton and Ravi were still together, with Peyton working as a DA in Atlanta and Ravi serving as the head of the CDC (despite making a good chunk of change from book deals and speaking appearances after becoming famous for discovering the cure for zombies).
Does Blaine turn back into zombie?
He is the first human zombie to be cured. He is also the first cured zombie to become a zombie again and then cured again, and turned back into a zombie again.