Sparks's expression flattened when thinking over that question. A few came to mind, but there was one who stood out as the most infuriating criminal he'd ever dealt with.

"Jib Janeen. Jupiter spy. He, uh. Um. It was..."

There's a pause as Sparks starts to shift a bit uncomfortably in his seat.

"It's complicated. Way too complicated."

After a moment, he cleared his throat and attempted to move on.

"Then there was Techs. He's a robot. Thorn in my side for ages until he finally got a glitch straightened out while in prison. Next thing I know, he's preachin' in tents, travelling around Mars. Whatever. It finally got him outta my hair."