Followers

Sven
Sven is a companion in Skyrim he is located in Riverwood.

To get Sven as your companion you have to make the Dark Elf look bad so that Camilla Valerius starts to hate him. You can do this by talking to him and get him to give you are fake letter, where you reveal afterwards that he faked it. Sven will be much happy and join you.

Note: He can play all instruments and can be found in the Inn showing his talents.

Lydia
You get Lydia as companion after you been chosen as the dragonborn. Jarl Balgruuf will offer her as your assistant and you will be her thane. She is an excellent theive.

Goldir
Help Goldir kill the warlock Vals Veran inside his family tomb. Afterwards he will wait outside where you can recruit him. Haven't tried him yet but my guess is that he is an Warrior that wields heavy armor and a long blade.

Note: You can only have one companion at a time.

Pawnira.