Electra

Cloud: Wild Stallion of the Rockies
http://i157.photobucket.com/albums/t71/yoyo586/horse/2f2608912ad00db5.jpg

Electra is first seen as Cloud's sister. Then she is seen mating. A band stallion takes her into his own family.

She is Cloud's half sister. She is a red roan with a lightning bolt going down her face.