Human Lego Man Alex McIntyre made a name for himself walking the streets as a life-size minifigure

The South Australian's autism made it hard for him to engage with strangers. Until he stepped outside in his fullscale, lifesize human Lego Man costume.

"I can walk down the street, I can get a wave, a beep, a photo, it's great," Mr McIntyre said.

"It makes me happy. And makes them happy that they can go on the rest of the day saying, 'Oh I saw a Lego man'."

The human Lego Man project began in 2012 after attending a friend's dress up 21^st party. One of the partygoers had made a foam Lego head, which he eventually gave to Mr McIntyre.

He slowly taught himself to make the body, and for the past year-and-a-half, has made himself something of a celebrity around his local area.

Now, he's building a few more characters - including a Lego policeman who's currently in the works - with the hopes of using the costumes to raise money for cancer research.

"My mum passsed away from the disease, she lost her life to breast cancer," Mr McIntrye said.

"So I wouldn't mind doing some walking for the Cancer Council."

With the suit weighing up to 6kg, Mr McIntyre is having to train hard in order to reach his long-distance goals.

"I walked around the Blue Lake [Mount Gambier], which is 3.3kms, [I walked around] five times for Cancer Council," he said.

"I love doing things that are long distance, like when I walked up from Valley Lake up to the [Centenary] Tower and back, that was five hours walking.

"And I didn't know until I checked the time. I was like, Wow, that's a lot of time."

On the immediate horizon, Mr McIntyre is also planning to take part in the Olivia Newton-John Walk for Wellness this year.

At a total 228km, it will be quite a task for Mr McIntyre to achieve, particularly with only small vents for air circulation.

"I walked in 27-degree heat and yes it was totally [hot inside]," he said.

"The only vents I have is [on the face] and on the front of my arms, but yeah I'll take it off periodically, I'll take a water bottle with me to cool off."