The text examples and the bird consist of several strokes, Grouped together before applying the animation.
The first two examples each consist of a single stroke. If you can manage to produce acceptable Ink drawings, this is the most “natural” way to animate hand-drawn objects and text.
PowerPoint has not provided this kind of animation until recently however, it is available only for Ink objects – see Replay and Rewind on the Animation Ribbon. The “natural” way to animate hand-drawn style is to actually mimic the drawing operations – stroke by stroke, following the lines of the drawing. I would obviously like to apply these techniques in hand-drawn style. Readers of this blog will know that I am an advocate of animation in presentations as a way to provide information in easily digested chunks and to keep the audience’s attention in a world of motion. Some of the available lined paper textures feature wrinkles and aging – these are probably not appropriate.