The protagonists are three fourth graders, Tigress, Rikiya, and Hawkuke...
At the beginning, the three are driving the Golden Tiger, Mach Flying Eagle, and Rikuo Elephant, which can transform into humanoid forms and merge into Voodoo Kong. They can transform into humanoids, and then merge into the Vorpal Vajra.
Then came Power Kong and Winged Dragon Kong.
These three machines can then be merged into the Super Voodoo Kong
The Genki Eruption is a robot cartoon that I watched as a child...it belongs to the Sunrise Blu-Ray Man series...there are three of them...the first one is Absolute Invincibility, the second one is Genki Eruption, and the third one is Hotspur!
These three cartoons are all about elementary school kids piloting giant robots to defend the Earth.
Absolutely invincible Lion Man-Phoenix. Goshura, the strongest of them all. The three cartoons are all about elementary school students defending the Earth, but "Genki Eruption" is a little different in that the three main characters have superpowers after their transformations. One is super-fast, one is incredibly powerful, one is clairvoyant, and one has wind ears... Compared to "Absolutely Invincible" and "The Hottest" where the protagonists don't have any superpowers after their transformations, "Genki Eruption" has a few kids with superpowers, but they can only do it as secret heroes because they got hit by magic in the first episode, and they'll be turned into dogs if they disclose their identities.
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The Absolutely Invincible Thor King
Every time there's a battle their classroom turns into a command room. The male protagonist is called Hitoshi Hitoshi, the students call him Hitoshi,piloting a robot hidden in the school building, when the robot comes out, the school building will be separated, this robot is a bit like a Transformer shape, the weapon he uses is a sword, called the King of Swords. Male number two called Aska, quite handsome character a bit like Sasuke, robot hidden in the playground under the runway, out of the playground runway will be folded, and then the robot to use the runway folding angle to take off, this robot is the shape of an eagle, called the Phoenix King. The third male protagonist forgets what his name is, but he pilots a lion's robot, which hides under the school's swimming pool, and when it comes out it is lifted up by the bottom of the pool, and is called the King of Beasts.
The three robots become humanoid robots after merging, and they use a must-have technique called "Absolute Invincibility".