Felix

There are 5 main types of Felixes, the first one you get is the Gem Felix. They are located in the Felix section in your Barraks. The other 4 Felixes are the Green Felix, the Ice Felix, the Cloud Felix, and the Angry Felix.

Obtaining Felixes
There are 2 ways to get the Gem Felix, the first way is to buy it from the Felix area in the Barracks. When you first start the game there is an event located in the quest section, where the Gem Felix pops up on many campain battle areas. You can fight the Felix, you have to kill him many times before you unlock him. With the other Felixes, sadly there is no way to obtain them without buying them.

Felixes Joining Your Army
The quest says that he will join your army, you might be thinking that you will be able to equip him as a troop, but then you may be wondering, what happens if he dies? Felixes do not die and are in the longrun worth the cost of the gems.