[9] After his parents' divorce, Mariano moved with his mother to São Paulo, where he entered in a gymnastics team in another club.

[9] In 2015, Mariano and fellow gymnasts Felipe Arakawa and Henrique Flores were suspended from the Brazilian national team for a month, after publishing a Snapchat video in which they made racist jokes addressed at another teammate, Afro-Brazilian gymnast Ângelo Assumpção.

"[citation needed] Besides being a professional gymnast, Mariano is also an internationally signed model.

[11] In 2019, Mariano is the face of Philippine-based international clothing brand BENCH's men's wear campaign in Brazil and Latin America.

[11][12][13] On 28 October 2021, Mariano revealed in an Instagram post that he is in a relationship with broadcast media marketing analyst João Otávio Tasso.