In a blender, combine the banana, half of the blueberries, coconut water, cacao powder, vanilla extract, and maple syrup. Blend until smooth.
Transfer the mixture to a bowl and stir in the chia seeds until evenly combined.
Divide the pudding between airtight containers, one per serving. Refrigerate for at least 30 minutes, or overnight, until set.
Just before serving, top with the remaining blueberries. Serve and enjoy!