Yrel, the Light of Hope, comes to Characters of Warcraft page
One of the things I personally love about Warlords of Draenor is the spotlight it puts on the draenei, and new characters like Yrel really give that spotlight emphasis. Yrel is one of the draenei who serves as a synecdoche for the whole expansion - what she experiences is what the draenei as a whole have experienced and what they will experience if she does not succeed. It's what fascinates me about her, about how she is the road not taken, the path that didn't succeed in our history.
If you want more details on Yrel, the spiffy new page for her is up here. But to really get to know her, you're going to have to play through Warlords of Draenor (specifically on the Alliance side, for the most part) and I for one recommend it. Yrel is an excellent draenei face character, one who showcases the race's forgiveness, determination and courage.
