This mod adds four new companions to the game. Dragonborn is required.

Eradar
An Imperial 1H Warrior
Can be found at Windhelm's East Empire Company

Tanya
A Nord 2h Warrior with a secret
Currently staying at Old Hroldan

Luthien
A Wood Elf spellsword
Visiting the Retching Netch in Raven Rock

Kalei-Ra
An Argonian Assassin
Hiding out in Beggar's Row in Riften

All are essential and can be married.

Requirements:
Dragonborn DLC
Vanilla Hair Variety Plus by Omega99jp
http://www.nexusmods.com/skyrim/mods/28936/?

I use Ethereal Elven Overhaul, and you should too.
http://www.nexusmods.com/skyrim/mods/24273/?

Special Thanks to BearSprite for his endorsement