A couple of ideas for typography animations and letter (hover) effects for playful interactions. Anime.js is used to create animations.
span injector for radical Web Typography.
An experimental letter animation made with SVG and anime.js based on the Dribbble shot "Shading Letters in Illustrator".
Letter by Letter JS is a lightweight jQuery plugin to present text letter by letter on a HTML page. This text can appear as if was just being typed, or it can fade in more gently.