Micael Galvão was born on October 8, 2003, in Manaus, Amazonas, Brazil. He began his Brazilian Jiu-Jitsu journey at the age of four under the meticulous guidance of his father, Melqui Galvão. At ten years old, Mica broadened his grappling foundation by integrating Luta Livre Esportiva (Brazilian catch-wrestling) into his training regimen. In March 2021, he earned his black belt in Luta Livre from Master Totonho Aleixo, further solidifying his diverse grappling skill set.

When Mica turned 13, his father made the strategic decision to withdraw him from formal schooling, allowing complete immersion in Brazilian Jiu-Jitsu training and competition. This singular focus accelerated his progression through the colored belt ranks, enabling him to successfully challenge elite adult competitors while still a juvenile. This intense dedication forged Mica into one of the most technically proficient and strategically versatile grapplers of his generation.

In 2022, at 18 years old, Mica Galvão initially made history by becoming the youngest male IBJJF black belt world champion, capturing gold in the middleweight division at the 2022 IBJJF World Jiu-Jitsu Championship. However, his title was subsequently revoked after testing positive for clomiphene, a banned substance prescribed by a physician for therapeutic reasons. Due to his failure to request a Therapeutic Use Exemption (TUE), Mica accepted a one-year suspension beginning July 22, 2022, and was disqualified from all IBJJF-sanctioned results since June 5, 2022. He publicly addressed the incident transparently, reaffirming his commitment to clean competition moving forward.

Returning from suspension in 2023, Mica quickly regained competitive momentum by securing gold at the 2023 IBJJF World Jiu-Jitsu Championship. In 2024, he embarked on an ambitious quest to achieve the rare Super Grand Slam. Demonstrating exceptional technical precision and strategic adaptability, Mica completed the IBJJF Grand Slam by winning gold at the 2024 IBJJF European Jiu-Jitsu Championship, 2024 IBJJF Pan Jiu-Jitsu Championship, 2024 CBJJ Brazilian Nationals, and 2024 IBJJF World Jiu-Jitsu Championship. He then captured the prestigious 2024 ADCC World Championship title, becoming only the second athlete in history—after Rubens "Cobrinha" Charles—to accomplish this remarkable feat within a single year. Throughout 2024, Mica consistently passed multiple USADA drug tests, publicly underscoring his renewed dedication to clean competition.

In 2023, Mica and his father, Melqui Galvão, parted ways with Fight Sports to establish their own academy, Melqui Galvão Jiu-Jitsu. Relocating their training base from Manaus to Jundiaí, São Paulo, they aimed to provide their athletes with increased exposure and greater financial opportunities. Under Melqui's experienced leadership, Mica now spearheads a talented young squad, including notable competitors such as Fabricio Andrey and Diogo "Baby Shark" Reis.

Beyond his competitive achievements, Mica Galvão actively advocates for animal welfare. In 2019, he adopted a vegetarian lifestyle, attributing this dietary shift to enhanced athletic performance, improved recovery, and overall well-being.

On April 5, 2025, Mica Galvão enlisted in the Brazilian Army, achieving the rank of Third Sergeant. This enlistment marks a new chapter in his life, reflecting his ongoing commitment to discipline, service, and personal growth beyond the mats.