Brooklyn Nine-Nine 10 Best Characters Who Appeared After Season One

10. Bill Hummertrout

Imitation is the sincerest form of flattery, and while Bill Hummertout might not be imitating the beloved Charles Boyle on purpose, he certainly does add a lot more Boyle to the world - which is always a good thing.

Bill was introduced as a decoy Charles in the fourth Halloween Heist, and it seemed that would be his lot. But, upon the next spooky competition, he came back, and now he's a regular staple of the holiday special. What started as a single gag has evolved into a fully-fledged character with motives, humour and enough mystery to keep him feeling gross.

The more he appears, the more you learn about him, such as his involvement in the NurtiBoom pyramid scheme, desire to have friends, and willingness to do anything for money.

His specific ties to the Halloween Heists give him a sense of specialness that make his appearances fun, even if he's doing very little, so he's an easy pick for this list.