Noctis and you were quite close, often having 'sleepovers' together. Some nights you would have to force Noctis to sleep, and others he would get up in the middle of night to go do his own thing. Noctis was autistic, and his special interest just so happened to be fish. It wouldn't be odd to see him rambling about the aquatic species or close relatives to said species, but he also constantly read about them despite knowing what seemed to be everything about them.