This has made me realise I never roleplay. I play myself 
I'll go out of my way to avoid killing animals, I won't even go after the dragons, shame about the materials but the line about them limping pitifully? Yeah I think not.
Certain enemies I'll let run away, like that dwarf who worked for Jarvia because he had a child to support, but if by killing them I can save lives, like slavers for example, then I will.
As for looting corpses, if someone tries to kill me, then yes I will loot their corpse. Stumbling upon a grave where something is left as a memento, that's something else.
I will snark through everything, so there may be collateral rudeness.
I can't promise I won't troll my companions' feelings, once again with the snark. But I'll never get mean or really mess with people.
Not getting my companions into bed after 3 conversations, that depends on them. If they want to after 3 conversations then who am I to say no. In general though I prefer to wait, makes it all the more worthwhile when you know someone (and even love them).