Trickmaster

The Trickmaster is a boss from Kingdom Hearts and Kingdom Hearts: Chain of Memories.

Kingdom Hearts
The Trickmaster is a special Heartless with the ability to steal people's memories. It was sent to find the Wonderland keyhole and destroy Wonderland's heart. It was also sent to capture Alice. Though it succeeded in the latter, the Trickmaster was defeated before it could destroy Wonderland. Throughout most of Kingdom Heartss adventure in Wonderland, the Trickmaster is referred to as the shadows or as the darkness (especially by the Cheshire Cat). It was the one who attempted to steal the heart of the Queen of Hearts.

Kingdom Hearts: Chain of Memories
Trickmaster breifly appears as a boss and a theif, stealing the Queen's memory.

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."

Card
see:Trickmaster (Enemy Card)

Final Mix
In Kingdom Hearts Final Mix, the Heartless was recolored with pink replacing red and lite-purple in place of black, giving the TrickMaster a more Wonderland-ish look.

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TrickMaster (Final Mix battle)

Trivia
Despite being appearing to be one of the largest Heartless Sora fought, it was roughly the size of Donald Duck; Sora battled it while they were tiny.