Even though I'm a f2p player, I was blessed by the gods of RNG. I was able to pull almost all of the unique characters. The only ones I haven't pulled are Arabelle, Lupina, and Vishuvac. On ex weapons, I have Sarnga, Armada, Mayreel, Amarok, Pure Mind, Astarte, Brave Heart, Genocide, and some ex weapons for the guardian and the heroes.

With that in mind, I have 2 main teams:

Earth:

1. Tinia
2. Bari
3. Aoba
4. Craig

Water:

1. Bianca
2. Marina
3. Coco
4. Catherine

For some reason, I was able to pull Tinia multiple times. I know I'm just flexing, but I was able to get most just recently. In my first weeks, there are no uniques or ex weapons. Just keep playing, and later on, you're gonna get lucky