In this case, you can use Player Controller class. This class is designed to handle input and issue commands to controlled Pawns (Characters). However, this is not necessary, because input can be handled in Character class as well.
Please note, that this choice depends on input complexity and gameplay considerations.
If you like to learn more about Player Controllers and Pawns, please go here:
A good place to experiment would be 2D Side Scroller template, which you can find in New Project menu of the Editor.