User blog comment:Birdbot4444/Found Some Interesting Rank Patterns/@comment-5625448-20121202211835

I've noticed that to get Roman Soldier you need about 100 likes, for Minotaur you need about 200 likes, and for Viking you need about 300. Other than that, I have no idea what requirents there are.

Anyway, really good job collecting all that data. :D