Warlock. Old champ but still unique heal block capabilities through passive effects that no one is really immune to.
Also a nice collection of immunities. Tanky as a defender as well.
Thanksman
Def. Warlock, I have been chasing him as a 7* for a while now. Great pull. I have Mr. negative but I rarely use him. Beta Ray Bill I used for a while, but I ended up ranking up other cosmic champs over him.
Thanks Man, I did select Warlock, i hope you get your warlock in Apex Coliseum rewards.