Based on my design, the main color of one of my main characters is green (left one):

However, the combination of white and green looks a little boring. Therefore, I decided to add more details to the character by making the following changes:
- replace the curly hair by a green ponytail cap & a ponytail bun.
- introduce more shades of green & yellow to make it vivid.
Based on the refreshed design, there are five animations for the character, including idle, walk, jump, die, & being hit:

Here is the video, showing what it looks like when idling and walking:
By the way, these little cuties are created by Adobe Illustrator in pixel preview mode. For anyone who wants to use them in their project, please feel free to download them, you can change shape/color as you want as long as you claim the collaboration.

Download link: https://www.dropbox.com/s/zmv9hh1mnhevo5j/character%20animation.ai?dl=0