2D Pixel Asset
I very much enjoy creating 2D pixel sprites. I use Piskel on my laptop and Pixaki on my iPad to create the sprites.
When it comes to hand drawing assets, I use a drawing tablet and Photoshop on my computer, as well as Procreate on my iPad.
2D Drawn Assets
For working in 3D, I'm familiar with Blender, as well as grey boxing in Unity.