The Diablo Inferno is in the stands at home and away games to support their teams in full force. The Inferno has been recognized two years in a row as one of Orange County's top ten student sections by the OC Register. In 2018 The Inferno earned the #8 position and in 2019 they earned #5. The Diablo Inferno is organized by ASB, and especially by Junior, Allie Casarietti, as the MVHS ASB Hype Commissioner. 

• Student Section of the Week by OC Register - November 4, 2019
• 2019 Final Rankings by OC Register - November 26, 2019
• 2018 Final Rankings by OC Register - October 31, 2018

Homecoming Week at Mission is something that students and staff look forward to. This year's theme was "A Whole New Homecoming." ASB planned an entire spirit week for the school with games, dress up days, prizes and Diablo spirit. The Pep Assembly in the stadium included the entire school and staff and was a huge success. The football game had The Diablo Inferno dressed in class colors to show their pride. This year's half time show as the first time Mission has done a laser and lights show and the crowd loved it. The Queen, Yazzy Roundtree, was crowned at half time. The dance was on campus and attended by 1,100 students who had a memorable and fun time. The Homecoming King, Shaun Gold, was crowned at the dance.

The Mission Viejo High School ASB offers a wide range of activities for students to participate in. From on campus intramural sports, clubs, class activities, class fundraisers, dances, pep assemblies and rallies, Mission Matters Week, Clash of the Classes and various other opportunities for students to get involved and show their Diablo pride. Part of ASB's mission is to help find a home for each and every Diablo.