Gregory (a donkey) is best friends with Randy, Mildred, and Alastair. Together they form "The Gang".
Gregory is a nerd and proud of it, having as much interest in comics and cartoons as his friends. He's also a prankster, and plays tricks on people but rarely gets away with it- and getting caught is his biggest fear.
Gregory is also kind of snarky, offering witty commentary whatever the situation.

Oleg Chekov is one of Professor Blackheart's top minions- he's a straight-laced, rigid and overly formal Russian raptor of some sort, satirizing Soviet Union soldiers and spies.
Oleg's biggest weakness is another one of Blackheart's minions, the femme fatale Isabella Paprika, a snow leopard. He has a crush on her, and she frequently flirts with him, and causes him to goof up his missions.

Would you believe that both these characters came to me in a dream?