Ace

Ace is a changeling. He appears in the novel Summer Knight.

Descripton
Ace has dark curly hair and a goatee. His faerie parent belonged to the Winter Court, putting him under its rule. He was friends with a group of Winter Court changelings: Meryl, Lily, and Fix.

Biography
In Summer Knight, while Listening, Harry hears Ace say to his friends that he searched for Lily all day, that he believes Harry is in Mab's pocket, that Harry kills people who get in his way. Harry followed the three changlings out to alley where Ace pulled a gun on him. Meryl told him not to be stupid.

Later, it's found out that Ace promised the Red Court to kill Harry Dresden in return for protection from the Winter Court, notably Winter Lady Maeve and Winter Knight Lloyd Slate. To this end he hired the Tigress, a ghoul assassin, and also tried to shoot Dresden himself, but missed and hit Meryl instead. His changeling friends and Dresden found out, but let him live and sent him away.

In Cold Days Ace is revealed to be one of Winter Lady Maeve's supporters, and the mastermind behind several of the most successful attempts on Harry's life. It's also revealed that his faerie parent is the Redcap. He has a contingent of mercenary small folk working for him similar to the Za-Lord's Guard, led by Lacuna. Ace is killed attempting to board a boat during Cold Days' finale, shot by Harry Dresden.