Can secondaries gain moves?

[Kakashi Hatake]

I had this typed up before Sasuke beat me, so I'll just leave it anyway as an agreement with his answer.

Unless you have them as an assist or something it won't matter in combat. So as it's just flavor in that instance, I don't see why not. Omni allowed a similar thing with Retane's secondaries (he gave them proficiencies, though I assume it would work the same.)

Edit for clarification: you'd obviously need to buy the moves for an assist to use if you're going that route. If it's just for writing fodder it'd be free. Probably obvious, but ya' know.