I am new

Hello, My name is NO NAMES ON INTERNET and I am new to writing in general, not to mention fan fiction. I am not the best, and even though my brother is talented, he still is unable to help me revise or edit mainly because he simply does not care that much. Now, for those of you at my school, if you read this, my internet name is the same nickname that I chose when I came to the school. but in order to find it, you must answer this riddle

This is a creature, which god gave man
when he saw how feeble they were to become
this creature is the king, and the assassin
it is the fastest creature alive
and yet, does not make a sound.

The color of the poem is also the name of my RIDDLE ANSWER so if you heard me talk about her, this should help.