I feel like that's would be for the best plot-wise. school prez seems like he was not that interested in himeri when she was herself but he kinda gains interest in her when it's her brother's persona. and the childhood friend seems to have a crush on the sister and I doubt it would be appealing for the reader if he'd fall in love with her again but in the brother's body lol

Im really cheering the brother to end up with the school prez, but i think it will make more sense with the plot if the brother end up with his childhood friend and the sister with school prez bcs they focus on the backstory of the siblings feelings. But who knows, i love plot twist and unusual plots