Here's a slightly expanded version of Cyrean's history from the one in her ingame bio:
"She" was created by House Cannith as part of Cyre's military during the Last War. She was designed to be a combat medic for the "fleshie" troops. Her designers gave her high survivability, some combat ability, and a female voicechip (apparently they thought that would help put the wounded more at ease during treatment). They didn't bother giving her much theological training, just generic "Sovereign Host". When Cyre was rendered uninhabitable to humans, she was abandoned along with the rest of the warforged troops, and found herself in the company of warforged who she couldn't heal effectively and who were generally hostile to "fleshies". Still motivated largely by her programming, Cyrean left the Mournland to find some purpose more to her liking than "death to all fleshlings" (a common motto of the followers of the Lord of Blades).
After leaving the Mournlands, she wandered through several regions of Khorvaire, trying to find work as a healer, only to find that most people viewed warforged almost exclusively as killing machines, and preferred to get their healing from House Jorasco (which wasn't interested in hiring an ex-military unit that might secretly be programmed to kill enemies of Cyre instead of healing them). During her wanderings she acquired her name (Cyrean was one of many nicknames attached to her during this time, and one she preferred to Nannybot or Docbot) and a slightly more sophisticated understanding of theology. She still follows the Sovereign Host as a pantheon, but has more definite leanings toward Boldrei (god of Community) and Onatar (god of Artifice and the Forge) than previously.
Finding Khorvaire seemed to have no use for one of her particular origin and talents, she eventually decided to try her luck in the less settled region of Xen'Drik, hoping the treasure-seekers and explorers there would be less choosy about their healers than the citizens of the civilized nations of Khorvaire. Upon arrival, her ship was destroyed in a dragon attack, and she set about helping the people of Korthos village free themselves from the dragon and the sahuagin Devourer cult that seemed to be using it. It was near the end of this series of adventures that she encountered the mysterious barbarian Gelora, who thus far has been very reluctant to speak of her past, and the halfling rogue Teranaret, who seems primarily interested in acquiring wealth.
Cyrean's motivations so far are fairly simple - she seeks a community to take care of (still following the remnants of her original programming, but with elements of Boldrei worship thrown in). She would be delighted to find a group of people who would actually take her in and treat her as a valued comrade, but at this point her expectations are so low she'll settle for just being accepted as a robot healer and not presumed to be some sort of psychotic killer war machine. As for what she looks for in others - she's quite tolerant, though she does tend to take it for granted that everyone is inclined to be law-abiding (can cause some misunderstandings with the rogue). As her understanding of the spiritual world deepens, she's likely to develop an interest in discovering and thwarting the plots of cults of the Dark Six (such as the Devourer cult in Korthos).