After Shrek and Donkey save Fiona, what does Fiona first call Donkey?

His noble steed.

Explanation:

In the original dialogue of the film Fiona calls Shrek "a brave knight" and then goes on to say to a donkey "And that it would be a brave knight without his noble steed".

But after seeing that Shrek is an ogre he is disappointed saying that she wanted him to be saved by a knight and not an ogre and his pet.

noble steed

Explanation:

Fiona always believed she was going to be rescued by a knight in shining armor and his noble steed. Shrek was the knight and Donkey was the steed she expected.