Live 2D is a technique that can animate full dimensional 2D characters from manga, anime, and illustrations without undergoing a 3D transfiguration.An example of such is in this iPhone/Android app called Shizuku Talk.
One unique feature of this app is that you could interact with the character by touching the screen and she will face unto the direction of your fingertips.
Good things also is that the content on this app is updated daily with a voice acting.
I think this is a good app if you want to know some slangs used in Japanese conversation, though It is not really that easy to understand for beginner in Japanese.
Some other applications of Live2D are Anime clock Apps, although not as complex as Shizuku Talk.