One manga that might be similar is 'Starlight Shores'. It shares some thematic elements and character development styles with House of the Sun.
I'd recommend 'The Promised Neverland' as it shares elements of mystery and adventure like House of the Sun. The character development and plot twists are quite engaging.
You might want to check out 'One Piece'. Both have adventure and exciting storylines that could give you a similar feeling to Grand Sun. There are also diverse characters and a vast world to explore.
The main similarity could be the art style. Maybe both have a detailed and unique way of depicting characters and settings.
One manga that might be similar is 'Love So Life'. It has a similar family-oriented and heartwarming theme as Full House.
I'd suggest 'Dungeon Meshi'. It shares the concept of a dungeon setting and often features characters facing challenges within it. The art style and story progression might appeal if you like Dungeon House.
One manga that could be similar is 'The Promised Neverland'. It has a similar mysterious and somewhat creepy atmosphere.
You might like 'One Punch Man'. Both have dynamic characters and exciting plotlines similar to Sun Ken Rock. It also has a good balance of humor and action.
The style of Sun House manga is quite unique and visually appealing. It often features bold lines and vivid colors.
One manga that might be similar is 'Spy x Family'. It has a mix of comedy and family dynamics like in 'The Way of the House Husband'.
It's a captivating tale with elements of fantasy and adventure. The story follows the protagonist's journey in a world filled with magic and mystery.