Vincent Martella

Lore & Background

In the world of *Star vs the Forces of Evil*, Marco Diaz is a regular kid from Eclipsa, a small town in the American Midwest, who stumbles into interdimensional adventure when his best friend Star Butterfly accidentally banishes herself to Mewni. Vincent Martella's performance sells Marco's ordinariness—his deadpan reactions to talking swords, his quiet protectiveness, and his slow-burn realization that his feelings for Star run far deeper than friendship. The character is the audience's surrogate: confused, a little overwhelmed, but stubbornly kind.

Across the series, Marco's role evolves from comic sidekick to a fully realized protagonist. His arc touches on themes of self-worth, the fear of being 'just a normal person' in a magical world, and the courage it takes to admit love. Martella's delivery—measured, slightly wry, with an undercurrent of sincerity—makes those beats land without ever tipping into melodrama. In the series finale, Marco's choice to stay in Mewni and build a life with Star is framed as the show's emotional climax, and it works largely because of the foundation his voice laid over hundreds of episodes.

Fans often point to the quiet moments as Martella's strongest: Marco fixing a broken toaster in a Mewnian kitchen, or simply sitting on a porch in Eclipsa, staring at the sky. In those beats, the voice actor lets the silence do the work, and the character feels genuinely, achingly human.

In Their Own Story

The studio was quiet except for the hum of the air conditioner and the soft click of the boom arm. Vincent leaned into the mic, eyes half-closed, and let the line land: 'I just… I don't know how to be the only normal person in a room full of people who can turn into wolves.' He exhaled, pulled off the headphones, and grinned at the director. 'Take two?' The director nodded. Outside the glass, a storyboard panel showed Marco standing in a moonlit Mewnian courtyard, a tiny figure against a sky swollen with three moons. Vincent adjusted his posture, found the line again, and this time let the vulnerability sit in his chest before the words came out. The director called cut. 'That's the one.'

Reader's Guide

Star vs the Forces of Evil was created by Daron Nefcy and produced by Disney Television Animation. The show launched in 2015 and ran for four seasons through 2019, evolving from a lighter, more episodic comedy into a serialized narrative with deeper emotional stakes. Visually, the design team leaned into a bright, saturated palette with exaggerated character silhouettes, giving the show a distinct pop-art energy that set it apart from other Disney properties.

Vincent Martella joined the cast early in production and became a fixture in the recording booth. His chemistry with Edie McClurg (Star) and the rest of the ensemble was frequently cited by the creative team as a key reason the show's humor and heart worked. Nefcy has spoken in interviews about how the writing room built Marco's arc with Martella's specific comedic timing and emotional range in mind.

The show's tonal shift in later seasons—moving toward more serialized storytelling and heavier themes—was a deliberate creative choice that the cast embraced. Martella's ability to shift from quippy one-liners to genuinely tender moments in a single scene was a major factor in making that transition feel earned rather than jarring.

Production anecdotes from trade press and behind-the-scenes features often highlight the collaborative, improvisation-friendly atmosphere in the recording sessions, with cast members frequently riffing off each other to find the right comedic or emotional beat.

Did You Know?

• Vincent Martella was already a well-known voice in children's animation through his long-running role as Martin M. Mystery before joining the Star vs cast, making him a seasoned performer in the booth from day one.
• Marco Diaz is one of the few characters in the series who has no magical abilities, which the writing team used as a deliberate narrative device to ground the show's fantastical elements.
• The show's creator Daron Nefcy has discussed in interviews how Marco's character was designed to be the audience's emotional anchor, and his voice casting was a priority early in production.
• Marco's slow-burn romantic arc with Star spans the full four-season run of the series, making it one of the longest-developed character relationships in the show's runtime.