Zach was named after Zachariah, who was a high ranking angel,
the direct superior of Castiel and a direct subordinate of the archangels.
But after the fall of Lucifer and Gabriel fleeing, he served Michael and Raphael.
The angel had been alive for over 6 millennia.
He came to Earth following Uriel's death and after his betrayal was revealed.

It seems like zach is a strong willed and strict tokota,
but she's actually the friendliest tokota that you may have ever seen.
She has a weakness for berries and would eat them all the time.