If you're looking for manga similar to Choujuu Giga, you might like these titles.
Jacka is a young rabbit boy with a beetle horn on his head that pretends to be a superhero. He performs his hero duties with the help of his friends, Topo and Algernon.
Need a job done right? Call the Zenryoku Engineering Company! Staffed by hip-hop loving boss Oyakata, aggressive Ojou, babysitter-turned-worker Minarai and a variety of other motivated rabbits, Zenryoku Engineering Company lives by a simple motto: do our very best! From finding old fossils to building a bridge to help a young rabbit find his way home, there's nothing the team can't build or handle!
Johnathan Perkins, son of Vietnam War hero "Perky" Perkins, is an U.S. exchange officer serving in British Special Air Service (SAS). He and Sergei, a Russian Spetsnaz exchange officer, participate covert SAS actions behind enemy lines alongside British soldiers in Operation Desert Storm.