Sleet

History
Sleet was once an independent contractor partnered with the idiotic Dingo, but Doctor Robotnik 'persuaded' them to work exclusively for him. He and Dingo were tasked to hunt down the Sonic Underground band (Sonic, Manic, and Sonia). However, he constantly fails at his missions (due to his idiotic coworker Dingo) and only rarely succeeds. He does, however, appear to get away from being roboticized no matter how angry Robotnik becomes.

Personality
Sleet is a ruthless and greedy bounty hunter. He is a manipulative, cunning and surprisingly competent villain, often remaining level-headed and is genuinely dangerous to the Sonic Underground, although this danger is often counteracted by Dingo's stupidity. On at least one occasion he's shown he's willing to turn on Dingo for a higher profit.

Sleet is absolutely not to be trusted, as seen when he strikes a deal with Vincewho is willing to help him in return for money. Sleet promises to pay him in return for information, but when Vince says all he knows and asks for his money, Sleet doesn't keep his end of the bargain and instead has Vince roboticized.