He has no up B (because remember he has no attack buttons), and his double jump is very short with the hight of the jump not being variable like his standerd jump, but Footstools would have the same properties as one of his standerd jumps on the ground, allowing you to either tap it for a very short boost or holding it for a very large one. He regains his double jump after getting a footstool. Again, his fast fall and arial mobility/acceleration as well as his ground mobility/acceleration are VERY fast. He would be fairly heavy.
He could cancel his all his jumps (grounded jump, double jump, footstool) into a fast fall after frame 2 or 3. You know how in the mario games if you time 3 jumps correctly one after another you get a hight boost? Well the same here, and the thing is on the third jump you get heavy armor until you begin to decend, so you could run around and, with your extreme arial and ground mobility, JCFF (Jump Cancel Fast Fall) left and right in the same way you would fox trot or dash dance, with heavy armor on every third jump.
You could crouch with the shoulder button/sheild button just like in his games and while it wouldn't sheild, because he has no sheild, he would take 20% less knock back while crouching (with the shoulder button)