Ok, one more question I'm not seeing a page for the Faunus and was wondering what are, if any, limitations on the animal trait? For example I had a character in mind that was a spider Faunus and had 4 spider legs coming out of him back would that work or no?
Sorry for the late reply! In theory that should work, although worth mention is that aside from the background bonus Faunus get to Perception, there is no inherent benefit to being any particular type of Faunus. For example, your spider Faunus wouldn't be inherently good at climbing simply by his/her nature. Instead, you should assign his/her stats to reflect whatever capabilities you want the character to have. As such, if you did want your character to be good at climbing, then you should have high Agility and Endurance, since that would be an Athletics check.
Yes, that would require taking the Additional Weapon modifier. You can define your Additional Weapon as just about anything, whether that be some sort of web spray (a ranged attack) or just a kick from one of those extra legs (a melee attack), to use the example of a spider faunus. However, each additional weapon or attack per turn requires taking another instance of the Additional Weapon mod, so you need to have the DIS stat to match. For example, if you want to have a minigun with a high rate of fire that can hit multiple times per turn (let's say for example 3) then even though it's one weapon, because you want it to hit multiple times, you need the Additional Weapon mod for each additional hit (in this case 2) and as such you need at least enough Discipline to allow for those weapon mods (again, in this case 2).