Threadhopping with this character?: Love it. Just give me a warning, especially if we're in a private room or something. I've RPed in utter chaos for a long time.
Fourth-walling this character?: I'm not a huge fan of fourth-walling in general, but there's a degree of it that I'm fine with. Your character can absolutely recognize him from playing the game, but please don't tell him he's fictional.
Backtagging with this character?: Definitely.
Hugging this character?: Go for it.
Giving this character a kiss?: Go for it.
Something more intimate?: Go for it!
Relationships?: Tricky. He's rather allergic to traditional relationships thanks to growing up with his parents' incredibly toxic marriage, but it could be really lovely to see him be won over to having a relationship. It would take patience, but it could be totally worth it.
Punching this character (provided they can fight back): One of the beautiful things about RP is that anything can happen. Go ahead and take a swing if you feel like your character would do so in that situation. Please. I love action. Just remember Nathaniel is a Grey Warden in his prime, and by his own admission, he fights dirty.
Injury?: Yes. Nothing permanent unless it's been discussed.
Death?: Let's talk about it.
Is there anything you do not want mentioned near this character?: No. It's not that there aren't subjects he gets touchy about, but I certainly don't want to limit anyone. Touchy subjects are opportunities for RP.
Other Notes: Nathaniel grew up in a toxic family. Tags may include memories from that. If you prefer not to have that in a thread, please let me know.