Get it? It's like traditional vs. digital. Tradiginal XD
Anyways here's Palette and Digi having a fight. They're either training together or fighting because they're pissed at each other. I can see these two fighting/arguing about whether traditional art or digital art is better. (Sorry if you're wondering where this characterization is coming from. I've actually been developing these guys and their world for a while now. I'll make a drawing sometime with all the info on it.)
Anyways in this world, there are different sorts of clans divided into the different types of art. These two, as well as the others in my Art of the Ninja Character Concept drawing, are the leaders of their respective clan. They don't usually associate with the other ones but in the story I have in my head, they come together as allies to fight off art block monsters. Some of them are closer than others but these two don't like each other too much. They are more of allies than friends and choose to just tolerate one another. Palette and Digi are probably the most skilled in their art form compared to the others making them pretty great opponents.
Each different clan in general has different strengths and weaknesses. In this case, the traditional ninjas are graceful, precise, and agile. However they are a little more on the slow side. Digital ninjas are quick and efficient but not all that great when it comes to accuracy.