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This is a paid asset, but now you can download Walking Letters Free.
Walking Letters v1.0
Walking Letters pack Requires Unity 5.4.2 or higher. Walking Letters pack is a pack of rigged and animated letter characters of the English alphabet. The pack includes prefabs of 26 animated characters from A to Z with a run, walk and a backflip animation. All of the models have a unique hand painted texture with a dimension of 1024×1024. The models are low polyigon, with an average off 300 Vertices. The letters can be used as a s children’s educational game, puzzle game or as a funny way of spelling out text in your game.