Congrats to @Sunspeck for guessing the last cat! It was Crowfeather! Here's the next one.....

Fur of grey,
Eyes so blue,
Sister she had,
So anew,
Whitest birch,
Prophecy thought,
Hearing things,
Dreaming 'naught,
Gentle wing,
Lion for mentor,
Loving one at night,
Betrayed not so light,
Found love in another,
Bumble about,
Mates became,
Hearing loss,
Trouble coping,
Mates no more.

Who am I?

((I tried to make this one hard XD))