Modifiers matching sidekick:

• polite,
• loyal,
• dutiful,
• affable,
• stubborn,
• intelligent,
• devoted,
• wild-haired,
• tall,
• faithful,
• spendthrift,
• predictable,
• dim-witted,
• malevolent,
• good-hearted,
• upper-class,
• whiny,
• ragged,
• bumbling,
• snooty,
• supportive,
• self-regarding,
• unintelligent,
• gullible,
• foppish,
• steadfast,
• erudite,
• richly-voiced,
• unoriginal,
• unhygienic,
• murderous,
• spunky,
• vengeful,
• wilful,
• cultured,
• long-suffering,
• well-mannered,
• eloquent,
• stiff,
• adventurous,
• scheming,
• diminutive,
• rigid,
• trustworthy,
• narcissistic,
• friendly,
• driven,
• fussy,
• brave,
• cheery,
• sophisticated,
• optimistic,
• resourceful,
• twittish,
• inarticulate,
• gentle,
• childish,
• spoiled,
• evil,
• cute,
• fierce,
• dependable,
• upbeat,

Simple categories matching good-hearted:

• politician,
• president,
• hero,
• athlete,
• person,
• boxer,
• sidekick,
• caveman,
• narcissist,
• wizard,
• clown,
• son,
• lover,
• comedian,
• robot,
• invalid,
• chef,
• fool,
• criminal,
• child,