Invisibility: Normally Niall is invisible to mortals unless he wills it otherwise. Can you see through it, or sense his presence? How much do you want him to be able to be invisible around you?
Glamor: Niall looks human most of the time, a young man with shorn brown hair, brown eyes, and a scar on his face. When he drops his glamor (or if you can see through it) he looks very inhuman.
To quote the book: "His scar glared like a fresh jagged wound; his eyes reflected the streetlight like an animal's. His bones weren't quite right, like there were extra lengths or joints [...]. His cheekbones were too severe for a human's face, too angular, and his skin glowed as if illuminated by a light inside him, as if his skin were too sheer, like parchment over a flame."
Can you see through his Glamor?
Feeding: No he's not a vampire, but everyone familiar with Irial will know the dark faerie very much enjoy tasting your darker emotions. Niall may be a nice guy but now that he's the King of the Dark Court, your baser emotions (fear, jealousy, anger, lust, etc) will be very tempting for him. Is he allowed to sense, taste, and even feed off of your emotions?
Affection: Unlike
gentle_cruelty , Niall can control the addictive aspect of his Gancanagh heritage. If he chooses to he could use it but it's highly unlike he would ever, for any reasons. That doesn't mean he's not still very affectionate on occasion. How much touching would your character allow? (and yes, he swings both ways)
Invisibility: Are you okay with Niall being invisible around you? can you see through it?
Glamor: Can you see through his Glamor?
Feeding: Is Niall allowed to sense your emotions, taste them, and maybe even feed off them?
Affection: How much affection/touching are you comfortable with?
Other: Addition questions or comments