At this point why not just straight up say that every female from marvel/dc belongs to mc… Harem when done right is acceptable if the max number is at least 3. However when the mc is collecting women like Pokémon it just makes the whole plot of the story seem like it’s only about harem.
The only time harem is acceptable is when the MC is powered by said harem like an eroge protagonist. Otherwise, harem just reduces any meaningful romance and reduces the relationship to collecting pokemon level.