Character re-design. He features a bit in my latest chapter of The Amulet of Shades (Fimfiction version - ahead of the comic) —>The Amulet of Shades  
He is a ultra-high altitude specialist and works in recoinassance and espionage… And is really awkward around the ladies, poor guy. He tries, though.  
Story snippet:  
“I am needing your eyes in the sky for a different task.” Sensing the ponies’ movement, magical lighting switched on as Celestia made her way down to the head of the table. There were about twenty chairs on either side. Cirrus followed her part of the way along the elongated table, internally debating whether he should sit nearer to the middle, or closer to her highness. Or maybe he should take a seat at the opposite end? Closer was better, but he didn’t want to look like he was presuming anything.
 
He settled for three seats away. Celestia just watched him in silence with a raised eyebrow, her mane flowing regally. There was a subtle smirk on her face.
 
Crap. I need to consult with the manual about where a lone agent is supposed to sit when invited into the briefing room. I must look like an idiot.
 
Straightening up in his chair, Cirrus cleared his throat. “I understand, Princess. How may I serve?”