Pluto is one of the many characters in Head Soccer who doesn't represent a country. He is a reference to the popular anime series called 'Attack on Titan'. He's also a 5-star opponent that requires 20,000 points to be spent to play against him in Arcade, but when you unlock him, he will be free to be played against, like all of the other characters.
His Power Shot's name is unknown, although fans call it "Titan Shot." When he activates his Power, he'll suddenly spin around with blades quickly, causing him to lose any hat he's wearing. He transforms into a member of the Survey Corps. (as seen by his spinning blades, green cape, and 3D maneuver gear).
When he uses his Power Shot in the air, a giant monster (fans of Attack on Titan would refer to it as the titan to be called Annie or Colossus) lit in flame appears. About 3 seconds later, it'll charge towards the opponent's goal. The ball is located in his arm, which is hard to reach if you haven't maxed your jumping stats. If the opponent touches the ball, he'll be flung off-screen briefly. This allows Pluto to score a goal. It lasts for around 4 seconds.
His ground power shot is similar, though the ball is located at the monster's lower body.If the opponent touches it, the monster will eat the opponent, which will appear after about 1.5 seconds from the air, which is not giving much time for Pluto to score a goal. This power shot lasts for 4 seconds.
Pluto's Counter Attack is very fast. Pluto will zoom to the opponent's goal. When the opponent makes contact, he will disappear. It's very easy to catch this in his own goal. Only come directly into contact with it and the ball will catch after Pluto and he will dash the ball in his own goal. It may take some practice but it's a very easy way, so you would actually see that Pluto's Counter Attack is not that hard to block. Pluto's Counter attack lasts for 1 second.
To get Pluto, you must get 9 Achievements (except win without hurt) from defeating him in the arcade or you must pay him for 4,600,000 points. The Unlock Requirement is hard because you'll have to pay 20,000 points to simply play against him. The best characters to get the Achievements are, as follows: Austria or Nepal (for the not conceding a goal), Italy (5 Counter Attacks) and Thailand or Ukraine (Jump). (Do not think it's that hard to unlock him, it takes time and just points. Just do all the requirements one by one if it's too hard.)
If you are playing againist him, when he uses his air shot, just spam your jump button. The delay will help you block his powershot, and most of the time it may result in an own goal. When he uses his ground shot, stay on the ground and try to counter it, and if you fail, the ball will bounce all across the terrain.
The delay only helps opponents defend your air shot. Pluto's air shot works best when you use it close to the goal, so your opponent won't have the time to block it.