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Issues: Kingdom Hearts X information and stats
The Heartless Tsum is composed of multiple stacked Tsums based on pre-existing Heartless, including (in no particular order): One Shadow, two Bandits, two Soldiers, two Powerwilds, two Aeroplanes, two Air Soldiers, one Darkling, one White Mushroom, two Minute Bombs, one Pirate, and one Burrfish. The Tsums appear to be haphazardly stacked atop each other, mimicking the gameplay of the LINE: Disney Tsum Tsum mobile game.
This giant Heartless has two attacks: one in which a gloved hand materializes behind it to give it a poke, causing all the stacked Tsums to tumble and crash down onto its opponent. The second attack takes elements from the LINE: Disney Tsum Tsum mobile game; a symbol of a Shadow Tsum appears in the center of the screen, causing the stack of Tsums to all turn into Shadows. Then, the previously mentioned gloved hand plays a "connect the dots" game with the Tsums, causing them to crash down on their opponent in a similar manner, followed by a magic bomb that falls from the sky and explodes.