Arzel is the introductory spirit in the book New Avatar Power by Geoff Gray Cobb, but he's also a standalone spirit with an interesting history. From what I've been able to piece together, he's an angel of the East who is considered to be benevolent and helpful. My own experiences have shown him to be a magical powerhouse worth respecting and interacting with, so I provide this sigil with this in mind.
Doing so has created a wonderful amount of synchronicity, for starters, and he's easily accessible. I'd highly recommend starting with him if you're new to magic, as Arzel's been wonderful.