My characters change from armor to costumes behind the wooden panel screens.

I always enjoy coming up with a detailed backstory for all my "main " characters (meaning, the three I actually roleplay with, the rest are more like testbed characters and crafting support... although, that can chan ge, seeing how my third "main" started out as my crafting alt, but I ended up liking her enough to "promote" her to full RP character... )

My main usually tried her best to sneak past "animal" and "guard" type mobs, as befitting a sneaky bounty huntress who is there for the big shots with a price on their heads, not the local wildlife or their hired help. Unless its bandits or something, for those one gets paid by ear...
She also tends to be ruthless when it comes to quest choices, doing the job she was hired to no matter who gets hurt... but not actively evil, when she isn't paid to do bad things to bad people, she prefers to be nice-ish. I find it great fun considering which character would take what quest choice... some vary widely. Same for other considerations... she only uses daggers because small weapons make most sense for a sneaky rogue type character, and if there were crossbows, she'd be using those instead of her bow as well for backstory reasons (gods I hope someday ZOS will refit those to ESO). She kept every disguise, just in case... (and yeah, I also wish they'd remove all the disguises and give us the visuals as costume on a tab for those whose quest is completed, to free up her inventoiry) and I also picked her crafting skills for her backstory - provisioner and alchemist, cooking and poisonmaking (though generally not in the same cauldron, unless its that kind of job...)
I also take care with my criminal activities... always doing my best to avoid a bounty (fu... uhm... forget getting that achievement soon), not going on a murder spree without a contract, etc (still got mass murderer achievemtn... it just took quite a while longer). Even when it would be easy to avoid a guard, I find it more fun to keep to the realistic "don't get caught" theme... as it fits the character, she is not an bandit after all.

My secondary librarian often goes with an "do not attack unless attacked" theme, which can be a pain as he is a long range sorc build and thus often neglecting his best advantage... and since he is a good guy character, I'll never ever do the TG and DB questlines with him, merely visited the regions for the exploration and skyshards (and felt pretty vexed that a visit to abah's landing came with an automatic TG membership - talk about an offer you cannot refuse... ) For the same good guy reason, I saved Valaste instead of taking that folio from uncle cheo for extra skill points. Roleplaying trumps game effect for me any day!
Also, because he is a skinny librarian boy, he never learns blacksmithing... despite being a bit crafty otherwise, and also never took any intimidation on account of not being very intimidating, as a skinny dunmer librarian - apprentice wizard type... he is exactly the guy who gets intimidated himself (and his lunch coppers taken. And given a loincloth wedgie too)
And I really wish there were alternate weapons for destruction magic, I'd love to have him cast his spells from a spellbook instead with a staff... 's why I make suggestions like that on occasion...

And my third "main" is my crafting character, she is all paladin-like in her naive rightousness, and all too eager to bash all "evildoers" in her way (though sometimes a little confused as to who is how evil) - although that bashing mindset may be a part of her orc background... but she is always willing to stand up for law and justice (and again, not going to do any thieveing or contracted murdering because of it, and for her I really wish there was an option to play these DLCs from the other side, she's totally join the iron wheel...) She even refuses to use her intimidating presence to shortcut some quests if it would be "unjust"... and never was smart enough to become persuasive...

I have not had much of a chance to actually roleplay with them due to lack of partners, but that's no surprise considering my sociophobia... in time, who knows.