Legox (レゴックス) is a Seigi Chojin comprised entirely of building blocks.
A Dutch wrestler made of LEGO bricks that can transform into different shapes. However, a black brick among the blocks is the weak point. This led to his defeat in his match against Kevin Mask. He was defeated by Kevin Mask in the second match of the second round of "A" block in the Chojin Olympics: The Resurrection. He was defeated within 10 minutes and 36 seconds. Renamed Blocks in the anime for legal concerns.
StoryLegox appears at Kansai International Airport, where he engages in a demonstration with a truck to display his strength for the cameras, and crushes it with a bear hug until it is destroyed.  He is introduced for his match by Jacqueline Muscle, where he enters the ring eating toy blocks, and - much to Jacqueline's disgust - pours some into her hand.  It initially appears that Legox has the upper hand, but Kevin Mask applies a spin kick to his chin, and Legox is thrown to the ropes, which he uses to propel himself and bite on Kevin's shoulder. 
Kevin responds with a Mongolian Chop, followed by a Northern Light Suplex. Legox splits into many pieces, before he reconstitutes himself as a book.  He commits the Bookend Crush, sending blood spurting all across the arena, but Kevin eventually escapes and uses a Leg Lariat against Legox's face.  Kevin stomps all over his face until it cracks open. Legox grabs at Kevin's ankles and performs a Power Bomb Position, but Kevin quickly switches to a Franeknsteiner.  This is followed by a Heart Attack Stinger; this time - as Legox is turned into pieces - Legox re-configures as a giant slide. 
Legox sends his head down the slide and sends it flying into Kevin's stomach, before he uses Decoration Block to reassemble around Kevin and assume his form.  Kevin dislocates his joints to escape from a small opening in the abdominal region, but he matches an even match as Legox's new form now knows all his moves and techniques.  The raw power of Legox is higher than Kevin, so - being evenly matched - he had an advantage and starts to show signs he may win. 
Kevin starts to uncontrollably laugh.  He knocks off Legox's "ears" with his feet, before getting him in a Boston Club, and then traps him in a Royal Stretch. Kevin shatters him into pieces again, forcing him to drop the clone form, and resorts to a crotch attack to keep his advantage.  Legox is shattered again and turns into a steam-roller in one last attempt to defeat Kevin Mask.  Kevin waits until the last minute to get a left jab to Legox's most vulnerable spot.  Kevin exposes Legox's 'brain' and then smashes it to the mat in a Big Ben Edge, which effectively kills Legox and prevents him from regenerating. 
Legox loses at 10 minutes and 36 seconds. Kevin drops pieces of his body into Jacqueline's hand in an act of mockery, and - due to his death - he is not seen again in the manga. 
- Regeneration Block
- This move is basically Legox's ability to form back into a shape after he is separated into pieces.
- Bookend Crush
- Legox turns into a gigantic "Guide to Holland", and right side up, traps the opponent in the middle of the book like a bookmark and repeatedly opens and closes the book crushing the opponent.
- Sliding Cocobutt
- Legox's body turns into a big slide while his head slides down and flies into the opponents stomach.
- Decoration Block
- Legox splits into blocks and covers all of the opponent's body, making the opponent look like a gigantic doll made of blocks. This move possibly chokes the opponent and/or crushes them
- Sensational Clone
- This move is used after the Decoration Block. Legox stays as, or forms into the opponent, and can use all of their abilities, techniques and strategies as the Decoration Block reads their data.
- Steamroller (unofficial name)
- Legox turns into a steamroller and crushes the opponent.
- Submitted by: Toru Tanaka (たなか とおる)