out of character
backtagging: verily yes!
threadhopping: i would feel insulted if you didn't! (as long as it's withing reason)
fourthwalling: if it's spoiling Sif for Norse Mythology, go for it. she will laugh in your face so hard. or punch you. risk it.
offensive subjects: what's offensive??
hugging this character: do you want to??
kissing this character: if there's good reason; if there isn't any good reason, your character is free to try but the outcome might be death. or maiming.
flirting with this character: please.
fighting with this character: VERILY PLEASE
injuring this character: just let me know ahead of time! fighting logs are not always my forte, but i like to be aware of what injuries are plausible and which aren't. tldr: safer to discuss first.
killing this character: yo, definitely safer to discuss first, or i'll punch you.
using telepathy/mind reading abilities on this character: rather not
funky text: homestucks welcome, and get ready for all her '?????? speak clearly stop wasting my time'.