1. These 3 classes would actually make sense not only because of the Dream Sword, Staff and Shield you have to choose 2 from in the beginning of the first game, but also the recurring trio of Red, Blue and Yellow in the games (Valor/Wisdom/Master, Fire/Ice/Lightning). These are probably the basic classes with more, special classes are to be added in the later part of the game.
2. That orange and purplish color is just his fur, his jacket is red much like Power Form.
3.Not just similar, Mirage Staff and Double Arrowheads Drive Form are the exact same, stars on the sleeve and everything.
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KH13's D23 Japan 2018 Kingdom Hearts III trailer analysis