What happens when someone reincarnates into the world of Mha as Flowey? How would the Story change if everyone's favorite cinnamon roll had someone to believe in him since the beginning?

This is an alternative to The Shadow Guardian on my wattpad. Luz had a brother. Marcus was many things. A historian, doctor, fighter, comedian. Luz discovers he is also a magician. Follow Marcus (Not Luz) as he fights monsters and teaches magic, finds love and saves lives... All while keeping his promise to protect Luz