* Keiki aloha: This literally means "love child" but can be used affectionately for someone who is charming and lovable.
* Aloha ʻōpio: This means "young love" and could be used to describe a young and romantic person.
* Kānaka aloha: This means "lover" and could be used to describe someone who is passionate and loving.
You could also use a more descriptive phrase like:
* Ke kanaka i aloha nui ʻia: This means "the person who is loved greatly."
* Ke kanaka i aloha ʻia e kaʻu puʻuwai: This means "the person who is loved by my heart."
Ultimately, the best way to convey "lover boy" in Hawaiian will depend on the specific context and the desired nuance.