Merrill is an elven mage and a temporary companion to the Dalish elf Warden during the Dalish Elf Origin in Dragon Age: Origins. She is a companion and romance option for a male or female Hawke in Dragon Age II.
Merrill was born to the Alerion clan, which wandered the hills of Nevarra. She was the third child of the clan with magic born to her. Following the next Arlathvenn, the gathering of Dalish clans, she was given to the Sabrae clan to be the First to Keeper Marethari.
Merrill can recite all of known elven history and navigate the Fade, but has very little experience with the world or even her own people. Forced to flee north, she must find help for her people. Whatever the cost.
Source: Dragon Age Wiki , "Merrill," available under the CC-BY-SA License.