Modifiers matching sidekick:

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

Simple categories matching optimistic:

• child,
• billionaire,
• poet,
• scholar,
• person,
• director,
• philosopher,
• hero,
• lover,
• lawyer,
• writer,
• sidekick,
• clown,
• guru,
• soldier,
• politician,
• shyster,
• boxer,
• warrior,
• duck,
• invalid,