I'm currently writing the first draft of a Middle-Grade action/adventure novel about superheroes and there's a huge decision I have to make that could change the course of the whole story. The main character, Daniel, just gained his superpowers. He doesn't know how to control them, so he seeks out help from a more experienced group of superheroes. The leader of that group, Kat, has to make a decision as to whether or not she should train Daniel to become a superhero. But which is more interesting plot-wise? A master who DOESN'T want to train our main character (but does anyway)? OR a master who DOES want to train our main character? The former unlocks some major conflict, allowing Kat to act as the perfect antithesis for our determined main character. But I don't want her to come off as a jerk, or she'd have to have a very strong reason or motivation to do so. Of course, as she trains Daniel she slowly begins to accept the task. (sidenote: it's very similar to the way Master Shifu treats Po in the first Kung Fu Panda movie). The latter on the other hand still can show Kat's unrelenting determination to train this new superhero which will still test our main character with how difficult the training can be and having to trust his master (think The Karate Kid). But from what I can see it really doesn't give a whole lot of room for conflict. So which one offers more to the plot? Should I be worried about writing a plot that's too similar to another? And what motivations could Kat have that would allow her decisions to make sense?