Modifiers matching invalid:

• crippled,
• arrogant,
• socially-awkward,
• innocent,
• brilliant,
• insightful,
• weak,
• rigid,
• sympathetic,
• stubborn,
• aloof,
• bumbling,
• inspiring,
• gentle,
• inspirational,
• good-hearted,
• gangly,
• socially-unintelligent,
• scientific,
• socially-unaware,
• optimistic,
• kind-hearted,

Simple categories matching bumbling:

• comedian,
• nerd,
• geek,
• mayor,
• person,
• sidekick,
• detective,
• fool,
• bureaucrat,
• child,
• invalid,
• policeman,
• clown,
• thug,
• actor,