Trickmaster

Trickmaster is a Heartless boss from Kingdom Hearts and Kingdom Hearts: Chain of Memories. For defeating him on the first game, you get the Wonderland specific accessory, the Ifrit's Horn.

Kingdom Hearts
''Heartless that Sora and company encounter while they searched for Alice. His herky-jerky attacks and juggling act flustered Sora and the others.''

Kingdom Hearts: Chain of Memories
The Heartless in Wonderland that stole the Queen of Hearts's memory.

Victims of memory theft don't even remember what it is they forgot.

Riku's Story

The Heartless in Wonderland that stole the Queen of Hearts' memory.

It appeared to Riku as a token of the indeliable Darkness in his Heart.

Kingdom Hearts
The sneaky Trickmaster was a Heartless that Sora and his friends ecountered in Wonderland while searching for the missing Alice. Throughout most of the adventure in Wonderland, Trickmaster is referred to as the shadows or as the darkness (especially by the Cheshire Cat).

Kingdom Hearts: Chain of Memories
Trickmaster briefly appears as a figment of Sora's memory. He stole the Queen's memory, and she accused Alice of the crime.

The Trickmaster also appears to Riku, as a figment of his memory and a representation of the darkness within him.

Kingdom Hearts: Final Mix
In Kingdom Hearts: Final Mix, Trickmaster was recolored with pink replacing red and light purple in place of black, giving him a more Wonderland-ish look

Kingdom Hearts 358/2 Days
in 358/2 days appear in Wonderland Heartless very similar at Trckmaster but blue and pink.

Card
see:Trickmaster (Enemy Card)

Trivia

 * Despite appearing to be one of the largest Heartless Sora fought, in reality he was roughly the size of Donald Duck; Sora battled him while they were small.
 * The color pattern of this enemy may have inspired the design of the Wheel Master, a boss part of the Unbirths