MktBold Plain:

MktBold, a free comic display font has a soft, inflated silhouette that makes the lettering feel cut from rounded black shapes rather than drawn with steady strokes. The uneven tops, slight tilts, and lumpy inner spaces give it a loose cartoon rhythm that stays cohesive across the design.

That buoyant shape makes sense on kids' posters, casual game titles, snack packaging, party invitations, and classroom labels where a strict typographic voice would feel out of place. Short headlines and logo-style wording benefit most, since the broad rounded forms create a friendly block of text with an intentionally goofy bounce.