- Famous manager and director in Brazil.
- Godmother of Sasha Meneghel
- Godmother of Sasha Meneghel, Xuxa's only daughter.
- Was the manager and close friends with Xuxa for two decades before their break up in 2002, for creative differences on Xuxa's career. While Mattos focused more on Planeta Xuxa (1998), Xuxa wanted to focus on her much younger audience (her trademark).
- One of Xuxa's songs "Amiga" ("Friend") from her album "Tô de Bem com a Vida" was written in her honor (although not by Xuxa herself). The video was shot in secret to make her a surprise.
- Was intensely rigorous on the "paquitas" from Xou da Xuxa (1988) and Xuxa Park (1994), among them actresses Letícia Spiller, Juliana Baroni and Bianca Rinaldi, forbidding them of dating and strictly controlling their eating habits and school performances.
- Beyond Xuxa, also managed the careers of Brazilian athletes such as Vilma, Leila (volleyball players), Kaká, Dida (soccer players) and Xuxa (swimmer). Also, put Luciano Huck on Rede Globo after he left Bandeirantes.
- Is mentioned twice in Lua de Cristal (1990), both as a character and as herself.
- Responsible for Michael Jackson's "Dangerous World Tour" going to Brazil, his only tour to have done so. Xuxa herself is a big fan of Michael Jackson and met him at Neverland in the 1990s.
- Reportedly wanted the Paquitas to resemble a younger Xuxa, this being a reason the girls were mostly blond. However, Xuxa has repeatedly stated that the girls suddenly appeared blond in the studio on their own, rather than hers or Marlene's request. Xou da Xuxa (1988) was strongly criticized for not casting girls of different races.
- Her working methods and behavior as a manager and TV director are described as an "abuse of power" by Xuxa in her memoir, "Memórias".
- Some of the earlier Paquitas from Xou da Xuxa (1988) have recalled that they dropped out of the group after tensions and falling out with her. Andréia Sorvetão has stated that she decided to leave due to Marlene's gradual psychological pressure, which erupted after she missed a concert. According to Ana Paula Guimarães, Letícia Spiller also left the show after a boiled argument with Marlene.
- Xuxa: O Documentário (2023) displays her first meeting with Xuxa in 19 years without seeing or speaking to each other.
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