It might be a bit early to start laying down super concrete character ideas but since there's a focus on a knight and noble pairs I feel like it'd be most fun to start at the dynamic between the two and work out the characters from there. If anyone wants to brainstorm a type of knight/noble duo let me know here or wherever, there's a lotta potential for fun there. 

Maybe a pair that only recently were put together and butt heads? A meek noble paired with a brawler knight, and they both have to reign each other in to keep themselves from getting in trouble? A knight and noble so in sync that people mistake them for each other? Maybe something else entirely? It's tough to pick a direction someone halp