what if harry died soon after the final battle and collecting the hollows what if said hollows reincarnated him into an alternate world as grim jr. how would this decidedly different deathly prince shake up the underworld

requirements

1. jr. has both his underworld magic of this unlife and his hp magic and skills of his past life

2. jr. has a better relationship mini overall not getting jealous of her fame and skills

3. before his death harry extensively studied way more magics to combat Voldemort (charms, curses, runes, enchanting, transfiguration, elemental, occlumency, legilimency, alchemy, rituals, and potions) I always found it kinda annoying that harry didn't know more magics by the time of the final battle considering Voldemort has like way over 50 years of study and experience

4. harem

optional

1. the powers of the three hollows followed harry to his new unlife in some way or form

2. Lemons

3. whether jr. still becomes a narble reaper hybrid and if so the same way as canon or different and any new abilities do to his magic powers