Omg please give me all the headcanon . . . BUT YES for her end, she worked for Noct's father as a researcher, and one time got saddled with watching baby Noctis, and then suddenly he asked questions and she taught him and he got attached and kept coming back and there we are.

So yes tell me about child Ignis and how he and Ros interacted, b/c I feel like Ros takes one look at another baby following Noct around and is like god please i am not running a school, where did you even come from.