Riel's Callsign (Poll) (Patreon)

 Hello, it's time to vote on what you should think Riel's callsign should be! Spiel on callsigns below if you're new to this!

Callsigns are codenames or nicknames that the Shepherds assign to each other, generally to refer to each other in incognito/coded messages or to address each other in the field when identities should remain a secret or a mission is being conducted subversively. 

I'm not great at coming up with these types of names, so I'm leaving the ones I'm not sure about open to polls. Generally these callsigns relate to an officer's powers, personality, or background in some oblique way, but not always, and sometimes they're chosen by an officer themselves, and other times they're assigned against the person's will. (For example, Lavinet may prefer a more romantic callsign but may not get a choice in the matter, lol).

What do you think Riel's callsign should be?