Familiar is always spawned in the first spot, no matter who is wearing it.
Familiar trains 100% HP and has the passive ability of quillboar damage.
All damage that is dealt to the Quillboar is also dealt to the opposing team in the form of "pure" damage like the RoBF. If there is just one minion, it does 100% to that minion, 5 minions it does 20% to each, etc.
The Quillboar cannot gain the effects of GA, if your team has GA it will be cast on everyone but the Quillboar.
If you trian AMF, the Quillboar will reduce the total effect by 25%.
If you fireball your own Quillboar, your team takes the damage, not the enemy.
As always, feel free to comment on, give suggestions, and bash my ideas.