Fan Casting The mysterious bird from space in Angry birds (live-action, CGI movie)

In a post-credits scene, Natty, Jessica (with these two being girlfriends now), Charles, Johnny, James and Corey (now being friends with them) are walking together to see where they are going to go, but out of nowhere a frozen meteorite falls from in front of them, and out of nowhere a mysterious bird made out of ice comes out. Seeing that it looks like her old friends, Natty asks him "are you an angry bird?", to which he replies "well, let's say I'm an old ally of theirs" and the credits begin