Mastu Biography: Height, Ethnicity, Age, Net Worth, Siblings, Parents, Girlfriend, YouTube, Music

Théo Becker, widely referred to as Mastu, is a French YouTuber, Twitch streamer, and singer celebrated for his humorous vlogs, skits, and challenges.

With over 6.4 million YouTube subscribers and 3.1 million Instagram followers, he is a leading figure in French digital entertainment.

Starting under the pseudonym Masturbatman in 2015, he gained fame with viral videos like “Avoir le BAC avec 2 en Maths”. He joined the RedBox collective before co-founding the LOAT studio with Joyce.

Profile

• Full Name: Théo Becker
• Stage Name: Mastu
• Born: 8, November 1997
• Age: 27 years old
• Birthplace: Reims, France
• Nationality: French
• Occupation: YouTuber, Twitch Streamer, and Singer
• Height: Unknown
• Parents: Mr. Becker and Mrs. Becker
• Siblings: Unknown
• Spouse: None
• Girlfriend: Unknown
• Children: None
• Relationship: Dating
• Net Worth: $1 million to $5 million  

Early Life and Education

Théo Becker was born on November 8, 1997, in Reims, France, and was raised in Saint-Dizier, Haute-Marne, by his French mother after his parents separated when he was two years old. His father is of African descent.  

Théo Becker briefly attended the University of Nancy for biology but dropped out after five months, finding the schedule unappealing. He later attempted a DUT in Multimedia and Internet (MMI) but left after a few months to focus on YouTube. He is of French ethnicity, and his religious affiliation is unknown to the media.

Career

Mastu launched his YouTube channel in November 2015 under the name Masturbatman, posting comedic vlogs and gaming content, such as Rocket League and Akinator.

His early video “MA NOUVELLE CAMÉRA” marked his debut, but a 2017 viral video featuring a driving school instructor dancing to “beautify” music skyrocketed his channel from 10,000 to 40,000 subscribers.

To avoid demonetization, he changed his pseudonym to Mastu in May 2017. That year, he won the FantaXYou contest, coached by Amixem, boosting his visibility. In 2018, he joined Amixem’s RedBox collective in Angers, collaborating with creators like Joyce.  

In 2020, Mastu and Joyca left RedBox to create the LOAT (Local Of All Time), a creative studio for vlogs and collaborations, including Clash Assassins with Ubisoft for Assassin’s Creed Valhalla, which hit the SNEP Top 100. His 2021 single Déprime addressed YouTube’s pressures and his depression, resonating with fans.

By 2021, he was among France’s top 10 creators for subscriber growth, per YouTube, and walked the Cannes Film Festival red carpet in 2022. His videos, such as “Undercover Nocturne” and “On Dort Dans Des Airbnb Insolites,” average 183,600 engagements, with strategic uploads on Fridays at 8 PM.  

Mastu’s Twitch channel, launched in 2018, experienced growth during the 2020 lockdown, thanks to Animal Crossing streams, and now boasts over 1 million followers. He competed in Squeezie’s GP Explorer (2022, 2023), Eleven All Stars, and the 2024 DTR Fight boxing match against Djilsi, which drew over 1 million viewers despite his loss.

In 2025, he joined Stream for Humanity, raising €3.48 million for Médecins Sans Frontières. His recent content includes Fortnite streams, car vlogs, and collaborations, maintaining his signature humour despite a 2022 break driven by harassment.  

Social Media

• Instagram Handle: @mastuu_
• Twitter Handle: @Mastuu_
• TikTok Handle: @mastuu_

Personal Life

Mastu is in a long-term relationship, though his partner’s identity is private. He faced severe harassment in 2022, with fans invading his angry home near a school, leading to a YouTube break announced on December 21, 2022.

He resumed in February 2023, addressing burnout and fan pressure on Twitch. Raised primarily by his mother, he remains close to her, often sharing childhood anecdotes. His cat, Pumpkin, features in his content.

Net Worth

Mastu’s estimated net Worth is $1 million and USD 5 million. His income is derived from YouTube ad revenue, Twitch subscriptions, and sponsorships with brands such as Cdiscount Sport and Ubisoft. His LOAT studio and event appearances, like GP Explorer, contribute significantly.