Classic Disney Channel:
* Miley Cyrus (Hannah Montana): Liam Stewart
* Brenda Song (The Suite Life of Zack & Cody): Zack Martin, Cody Martin
* Cole Sprouse (The Suite Life of Zack & Cody): Cody Martin
* Dylan Sprouse (The Suite Life of Zack & Cody): Zack Martin
* Demi Lovato (Camp Rock): Nate Gray
* Selena Gomez (Wizards of Waverly Place): Justin Russo, Max Russo
* Jake T. Austin (Wizards of Waverly Place): Max Russo
* Mitchel Musso (Hannah Montana): Oliver Oken
Modern Disney Channel:
* Zendaya (Shake It Up): Rocky Blue, CeCe Jones
* Ross Lynch (Austin & Ally): Austin Moon
* Laura Marano (Austin & Ally): Ally Dawson
* Dove Cameron (Liv and Maddie): Liv Rooney, Maddie Rooney
* Cameron Boyce (Jessie): Luke Ross
* Karan Brar (Jessie): Ravi Ross
* Peyton List (Jessie): Emma Ross
* Sabrina Carpenter (Girl Meets World): Maya Hart
* Rowan Blanchard (Girl Meets World): Riley Matthews
* Corey Fogelmanis (Girl Meets World): Farkle Minkus
* Joshua Bassett (High School Musical: The Musical: The Series): Ricky Bowen
* Olivia Rodrigo (High School Musical: The Musical: The Series): Nini Salazar-Roberts
* Matt Cornett (High School Musical: The Musical: The Series): E.J. Caswell
Note: This is not an exhaustive list, and there are many other male characters from Disney Channel shows.
I've also included some female characters for reference, as they often have male counterparts.