If you liked the Gad Guard anime, the Anime-Planet community thinks you'd like:
Misaki Suzuhara is a young girl who traveled to Tokyo to live with a relative, but ended up becoming involved in the greatest game of all time: Angelic Layer! In this fast-paced competition, players customize dolls and fight them in arenas of all sizes, hoping to gain experience and perhaps win the greatest tournament of them all! With new friends to meet and new enemies to defeat, the best time of Misaki's life seems to be just beginning. Join Misaki as she struggles to be the best, even in the face of overwhelming odds...
In Gad Guard, Hajiki controls lightning, making him the best fighting machine around much like Misaki does with Hikaru in Angelic Layer. There's no love like the love between man and machine and if you loved it in Gad Guard, you'll love it just as much in Angelic Layer.
When a group of children discover a strange cave at the beach, their lives are forever changed. Inside they find a hide out filled with computers and a man named Kokopelli who gives them a curious offer: to participate in a special game in which they save Earth from fifteen giant monsters. To defeat the invaders, he will give them a powerful mecha of black armor. The children eagerly sign the contract, name their new weapon Zearth, and must now take turns to pilot it; but the 'game' is in fact all too real and the consequences of battle become the stuff of nightmares. With no option to cancel the contract, is there any way to stop the game before it is too late for all of them?
Both Bokurano and Gad Guard contain a story driven plot that is accomplished through battles with giant robots. Gad Guard focuses primarily on teenagers whereas Bokurano focuses primarily on younger children, but both casts of characters deal with real struggles that most people in their respective age groups do not deal with, and for that reason I find the two compatible. Also, both series take themselves seriously, though Bokurao is arguably more psychological in nature than Gad Guard.
Follow interstellar bounty hunters Spike Spiegel and Jet Black as they scour the galaxy for criminals with prices on their heads. Hoping to escape their past, they live on the spaceship Bebop, but it's a dangerous business and old enemies don't forget easily. Allies come from unlikely sources, however, as they find comrades in the beautiful swindler Faye Valentine, the genius child hacker Ed and the genetically engineered 'data dog' Ein. Will they be able to help each other though their respective struggles, or is their fate really inevitable?
Kazuki Yotsuga is able to see things that others can't; in his visions, giant robots battle it out in the streets, causing massive damage in their wake. Though his visions have made him an outcast from the rest of his peers, they have attracted the attention of Ken Sanada – a physicist who believes Kazuki’s visions are a gateway into a parallel world! He places Kazuki into one of his inventions and accidentally sends him to the parallel world in his visions, where he finds himself in the middle of a war for control of the world! Kazuki must now become a pilot of one of the robots in order to join the fight for peace, all the while trying to find his way back to his own world…
Two major world powers have constructed the most dangerous weapon on earth: Tactical Armor (TA), an elite fighting mecha with extreme agility and fighting strength. Yushiro Gowa is the top TA pilot and captain of the Japanese Self-Defense Force, an orginization that uses the TAs to try and bring honor back to Japan. Yushiro must make a hard decision and face the truth about his past and the secrets of the Gowa family, who will use their adapted spiritual powers to summon Gasaraki and unleash terror on all of mankind.