Faendal was my best friend. I thought he was immortal. Until I killed him and didn't realise I was looting his dead body, then I started recognizing the gear. That was a sad day. Then I found Jenassa, a Dark Elf. Can't remember where I found her but she almost died too so I set her free (I plan on marrying her one day as she was continuously telling me how happy she was that we had met). Now I have that angry woman who wasn't aloud in the Companions, Ulfer or something? she is in the pub at Whiterun, I quite like her, I use her as a tank (I'm a sneaky bow and arrow sort of person).
So far i have only tried Jenassa a Dark Elf u can find at Whiterun, in the Drunken Huntsman. She is an awesome helper in battles! And yes, she tells u she is happy to know u even after u have nearly died together. She thrives on the adventure and battle u bring to her. She makes a great friend and follower! She will use weapons u give her and is able to help u carry some stuff u loot too without getting worn down too easy from it either. She will switch from bow and back to heavy weapon as the situation may require all on her own. I put healing type potions in her inventory in case she needs them and we function like a great team. I went on foot up to meet the greybeards up the mountain so i could take her with me instead of buying a horse because i do not know yet if a follwer can ride your horse with u. And yes, u could marry her because she is on that marraigeable NPCs list as a marriagible female. I saw her on the list when i was checking it out for a Nord Male for my female Nord character.

i thought if i knew who was on the list i could check some of them out during travels and quests to see if any were good along the way. So far i am enjoying being single and battling out out with my buddy Jnassa. She totally rocks!