I think Ms raifort (the history teacher) might be a villain.
so, she encourages you, who keep in mind are a child, to go find these four calamitous sentient objects that brought a kingdom into ruin. after you catch all four treasures of Ruin, she explains how she never thought you would do this much for her, and then, she says something very incriminating. she says that she would have looked for them herself and kept them (which is not in the nature of archeolegists), but you found them because you were pure of heart. this implies that she is not, in fact pure of heart. then, she says they were the treasures of her dreams, which contradicts her statement saying that she sought them out because of standard history preservation reasons. then, she says she will let you have them FOR NOW, implying she will atain them sometime later through... some means. then, as a reward, she HANDS YOU THE TM FOR NASTY PLOT. she then states that she will keep an eye on you. if you talk to her again, she openly states that she would "be happy to take them off your hands." why she wants the treasures of Ruin, I have no idea, but she is being transparently evil.