If you're looking for manga similar to Awajishima no Shichifukujin, you might like these titles.
Meet PET! PET (which stands for polyethylene terephthalate, a type of plastic) was a simple plastic bottle until nine-year-old Noboru Yamada recycled him. Now PET's a SUPER ROBOT programmed to protect Noboru at all costs! Whenever Noboru's in trouble, PET transforms, plugs in, and jets to the rescue! Unfortunately, PET's "help" usually does more harm than good, proving time and again that just because you call yourself "super" doesn't mean you have a clue.
Follows Shiro Kyoda, a young boy from Tamiya City and a student of the Bandai Elementary School. Shiro is an enthusiast of plastic model kits and "Plamo Simulation", a plastic model battle game. Shiro's dream is to become the representative of Japan in the World Simulation Tournament and be able to fight in the finals in the Battle of Hobbytopia.