Article in HockeysverigeRead the source grew up in Sävedalen in Partille municipality and played both handball and football as a child before focusing on hockey around the age of 13–14. In an interview conducted on Article in Her CampusRead the source, he recalled starting hockey at 6 after watching his younger brother play; his brother had started at 4.
Looking back on his technical development in a December Article in HockeysverigeRead the source interview with Hockeysverige, Portillo credited goalie coaches Peter Andersson and Nizze Landén. In the University of Article in University of MichiganRead the source 2022 profile, he also recalled a decision at age 15: he had considered quitting, but a former coach in Canada explained the opportunity to combine hockey and college studies and renewed his motivation.
Education also had support at home: in the March Article in Her CampusRead the source interview, Portillo said his parents and grandfather had encouraged him to keep opportunities open in both education and hockey. He graduated from KatrinelundsArticle in University of Michigan AthleticsRead the source in 2019.
Article in Michigan RossRead the source 2022, Michigan Ross identified him as a student in its Bachelor of Business Administration program, the BBA. Article in Michigan RossRead the source. Article in LA Kings InsiderRead the source 2023, he had completed 3 of the program’s 4 years, with the final year still left to finish.
In the university’s February Article in University of MichiganRead the source profile, Portillo discussed his interest in consulting and entrepreneurship. He was also mentoring young athletes through video sessions with Dualete at the time; the profile reported that the venture’s proceeds then went to the local Article in University of MichiganRead the source hockey community.