it's an aspect compel. but it can also be a discipline check.

hmmm...maybe a custom power...or something like the swords where status effects, for lack of a better term are erased...

wards need thresholds. so not really.

Storm Elemental (Feet In The Water)

High Concept: Living Thunderstorm
Other Aspects: Force Of Nature, Nothing Personal
Skills:  
Great: Fists
Good: Endurance, Athletics
Fair: Might, Alertness, Lore
Average: Presence, Intimidation, Conviction, Survival
Powers:
Wings [-1]
Hulking Size [-2]
Vast Extra-Dangerous Aura [-5]
Amorphous Form [-1]
No Internal Anatomy [-1]
Long-Range Potent Natural Weaponry (Lightning Bolts) [-4]
Supernatural Toughness [-4]
Inhuman Recovery [-2]
The Catch (Salt) [+3]
Total Refresh Cost:
-17
Refresh Total:
-11

Super bad! One thing...what's vast extra dangerous aura? don't know that one.

1) Adamsk was hanging out in the NeverNever on the other side of the bottom of a lake, and some event where Nick was on said bottom of lake and nearly died forced the two together. Perhaps something was attacking Adamsk. Good one.

2) Yes. Yes they can. Nice.

3) Hmmmm I'd say not so much. But I like where your head's at.

Addendum to summary, Nick remembers what happens when Adamsk drives (though in retrospect I wish I would have made that not so. I'd ret con it but it's his character concept and that seems rude).

So I have a kinetomancer. I know, I know, they do wonders with lasers to remove those these days but my insurance won't cover it. The deal is he's a pretty average joe that had a traumatic experience that bonded him with a water spirit (sorta like Bob is an air spirit). This spirit is all instinct (as opposed to Bob being all intellect) and is just sorta crammed into my player, Nick is the character. The upshot is Nick gets channelling: kinetomancy. Also, he gets a sort of spider sense about the supernatural, like if something is creepy or not. The spirit, Adamsk it's called, doesn't "talk" per se, but instead communicates more in flashes of "like" "don't like" "what is that" "WHAT THE HELL IS THAT??!!" and "KILL IT! KILL IT NOW FOREVER! AHHHHH SMASH!" So far I've been pretty lenient as the group has found it's legs with the game and the system etc, just making him make the occasional discipline check to keep Adamsk from psychokinetically smashing whatever is making him all sad panda. I'm about to up the scovell scale on this character and I've got some vague notions on what I ought to be doing in terms of sponsored magic maybe, or not, and certainly ways to ruin Nick's day with this (although I've gotta play it a bit soft on this sissies since they're for some reason scared pantless of EVERY THING and insist they suck at this game even though they've won pretty all right every time, too used to being high level d20 monsters I suppose).

But I wanted to put it to you fine bunch of smart alecks and cut throats. How should I handle this ability rules wise? What should I do to make it hard on him?

So, a summary:
Nick has a major aspect of "Head Roommate"
Adamsk is a water spirit of pure instinct
Adamsk provides Nick with kinetomancy and "creepy sense"
Adamsk occassionally responds to super naturals Nick meets with a fight or flight response which Nick must control
Adamsk is in no way hostile towards Nick or usually terribly concerned with what Nick's doing if it doesn't involve Adamsk
Adamsk's response to most things is "Fight, Flight, or Meh."
Neither party, at the moment, has any reason to try and find a way to disolve this partnership.

And go...

I would simplify things for yourself and the character. Give the dad a goal. He wants x from his daughter. Make it something the character doesn't want, but maybe even not a necesarily bad thing. Like he wants her to accept her place at his side blah blah blah. Doing so would, of course make her a non-player character. So she doesn't want that. So he gets in Fae tizzy and starts using all the gifts he's given her as a handle on her, the way Mab used Harry's debt to keep him in her clutches until she got what she wanted.

This way you've set up some things. Lots of story possibilities and a fun prod for your characters. A deus ex machina to bail her out if needs be (but SHE owes HIM so she won't want him to but that also means...). A resource NO ONE wants to use, but may if things are bad enough. AND because he's got a specific goal in mind and the debt is just a means to achieve that goal there is the possibility of her doing something that will allow him to release the balance owed.

And an occasional story hook since she owes him, he can literally MAKE her do some things as he wants (like Mab freezing Harry's eye juice or making him stab his own hand, though those might be a bit cruel and overt for a dad).

Don't know if that answers your question but I hope it helps solve your problem.