Mueller initially begins with four Crafts in the Second Chapter, none of which are upgradeable. During the Third Chapter he carries over his previous Crafts, of which two are upgradeable by increasing his level.
Mueller specialises in crowd control and AoE damage, with the possibility of inflicting a K.O. against his targets by drawing them closer and striking with force. Using him as crowd control, he is able to cause Confusion and has the ability to Impede Arts and Crafts of his targets. He can additionally use Deathblows against his targets making him an invaluable companion.
Mueller initially begins with one S-Crafts in the Second Chapter, which isn't upgradeable. During the Third Chapter he carries over his previous S-Craft, which is upgradeable by increasing his level.
Mueller is biased towards Water Arts.
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In the Second Chapter, Mueller has 1x Water and 6x Neutral Orbment slot, with 4x configurable lines. He features a maximum line configuration of 1x Water and 2x Netural Orbment slots, limiting his capability as an Arts user.
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In the Third Chapter, Mueller has 1x Water and 6x Neutral Orbment slot, with 4x configurable lines. He features a maximum line configuration of 1x Water and 2x Netural Orbment slots, limiting his capability as an Arts user.