Casting features original characters like African-American Jo and Mexican-American Rosa Flores (voiced by Lily Rose Silver) alongside Kid (Jack Fisher), reflecting organic diversity without any race- or gender-swapping of pre-existing figures. A minor alien side character, Hamburg, is depicted as gay in a relationship, but this remains peripheral and unemphasized.

Creator Craig McCracken has repeatedly described the series' core as exploring 'heroes help, heroes care, heroes sacrifice' through grounded human stories of compassion and loss, with no statements on activism, inclusion mandates, or challenging traditional norms. Reception shows no controversies, review-bombing, or audience pushback labeling it 'woke'; reviews instead praise the heartfelt action and character growth without referencing ideological messaging. As children's media, the incidental diversity receives scrutiny but does not elevate beyond minor elements that do not drive plots or arcs.