Sportacus is the deuteragonist of LazyTown. Sportacus describes himself as a "slightly above-average hero", though his friends have a higher opinion of him, calling him a superhero.
Sportacus wears an outfit that has several different shades of blue with stripes along it. He wears a dark blue vest, that is held closed by his Inferno case, over a short-sleeve t-shirt that which is light blue at the sleeves and the collar. On his forearms are bracers that are a combination of light and dark blue with some metal or silver detailing. His pants flare out slightly at the bottom and are a color combo of light and dark blue with white stripes running down the sides, he also wears a dark blue belt with a stylized 'S' on it. His shoes are actually boots, it's not very obvious since his pant legs cover them most of the time, and are a very deep color of blue, almost purple, with a '10' on the heels. He also wears a hat that looks like either a ski cap or a night hat that is dark blue in color with white stripes on it and has a pair light blue goggles attached to it. He is quite muscular, showing his health and fitness, and one of his most distinct features is his pointed mustache.
The local hero of LazyTown, who modestly calls himself only a "sightly-above-average" hero. He, presumably, comes from an island in the North Sea like his predecessor, who has been only identified as "Number 9" in the series. He is highly athletic, as shown by his name, and does flips and jumps to do simple things such as brushing his teeth or preparing himself a sandwich. His only weaknesses are: not knowing how or when to relax and sugar, with the second causing him to suffer an exaggerated sugar crash, which he calls a Sugar Meltdown.
Sportacus is a very understanding and modest person. He knows what he is capable of and is always worried for everyone. He's always trying to help people when he feels it's needed. He doesn't hate anyone (including Robbie Rotten) and he wants to be friends with everyone (even Robbie!). He always sticks with the kids when they are playing or doing sports and he knows what they are capable of. He trusts them a lot, enough to give them responsibilities, knowing they are going to do them. He's not perfect, and has been saved by the kids on several occasions, but he never gives up and he always does his job.
Sportacus was called Íþróttaálfurinn, which translates to The Athletic Elf, during the original plays that the show is based on. In the first play, Áfram Latibær (Go on LazyTown!), he had magical powers and dressed in an outfit that consisted of a navy-blue tunic, baggy scarlet trousers and a large brown hat. He also had a large, thick, blonde mustache and a matching goatee beard. In the second play, Glanni Glæpur í Latabæ (Robbie Rotten in LazyTown), his character became a lot closer what it is now. He traveled around in a hot air balloon (as opposed to an AirShip) and wore a brown and yellow version of his current outfit, with a larger, looser hat and sculpted chest piece.
While, in personality, he has almost no change, the background of Sportacus changes significantly from the plays to the TV series. In the original version, he was an Elf, like the tradition in Iceland states. For the TV Series, they have to make the character more universal, so, they transformed him into a superhero. He is still called an Elf in the TV Series dub in Iceland.
- According to LazyTown's Greatest Hits, his favorite song is Twenty Times Time.
- Apparently there was a Sportacus before him, known as Number 9 as mentioned in Welcome to LazyTown.
- Sportacus moves so much, that sometimes, he accidentally bumps into things, mainly his AirShip's door. He also did so once in the first Icelandic play, Áfram Latibær.
- When Sportacus was little, his name was Alex. One day, Sportacus 9 passed on his position as Sportacus to him, allowing Alex to be Sportacus 10, the current hero of LazyTown.
- There is a possibility that Sportacus might be related to Bessie Busybody. However, the idea is most likely headcanon.
- Sportacus' origin story can be found at the original LazyTown website, which is archived at web.archive.org: 
|Stephanie | Sportacus | Robbie Rotten | Ziggy | Pixel | Trixie | Stingy | Mayor Meanswell | Bessie Busybody | Minor/Guest Characters|