All character, background, rigging, and animating were done by myself using After Effects. Rigging (tried using the Duik Bassel plugin) needs more studying and practicing but I think animating the character was the most fun part of this project (took 1 month). 

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Created background using simple rectangular shapes for the building, strokes for the road markings, and a combination of 3 lines for the handrail (horizontal lines for top and bottom and one singular vertical line that is duplicated by using the repeater). To animate them, I keyframed the position for the building and the rest is done by keyframing the offset.

 

Skateboard animation is composed of several drawings (using shape layers and pen tool). I adjusted the rotation and position to look like the skateboard was twirling around. The up and down motion was lastly done by making the skateboard twirl into a pre-composite and then simply keyframing the position of the y-axis.