Eola

Eola is a female Breton initially found in the Hall of the Dead in Markarth. She is a follower of the Daedric Prince Namira and can be recruited as a follower after you help her clear Reachcliff Cave and agree to join her Cannibalism coven. She is a skilled mage, adept at destruction as well as capable of summoning Daedra to her aid and reanimating the bodies of slain enemies.

Quest
The Taste of Death

Play Style as Follower
Eola uses the Nightblade class template (destruction + alteration mage with good sneaking abilities and a preference for 1H weapons and light armor). She will use her ranged spells until out of magicka, then switch to a staff (if available) over a bow. Additionally, Eola is able to summon a Flame Atronach, as well as raising lower-level slain enemies, including humans, to fight alongside the party. It is unlikely that she will revive high level creatures such as Frost Trolls, Draugr Deathlords, and the like. Eola also utilizes the Oakflesh spell to augment whatever armor she is equipped with.

It is important to note, however, that Eola does not heal herself in combat even though she is a mage. She is a capable support fighter and will do well if the Dragonborn leads the attack, since she can summon undead or atronachs and cast ranged spells. Eola returns to Reachcliff Cave if dismissed.

Quotes

 * "I'm not just another pretty face" (During combat)
 * "You are a child of Namira now"

Source: Eola as my follower