Modifiers matching pretender:

• chivalrous,
• suave,
• deceitful,
• enigmatic,
• charming,
• secretive,
• dapper,
• inventive,
• jealous,
• immoral,
• psychopathic,
• cultivated,
• cultured,
• passionate,
• creative,
• talented,
• two-faced,
• mysterious,
• murderous,
• handsome,
• snooty,
• remorseless,
• ethical,
• sexually-confused,
• urbane,
• literate,
• diabolical,
• unfaithful,
• arrogant,
• aloof,

Simple categories matching mysterious:

• child,
• hero,
• phenomenon,
• entity,
• person,
• tune,
• crystal,
• being,
• mentor,
• artefact,
• actress,
• monk,
• executive,
• king,
• aristocrat,
• guru,
• relic,
• god,
• thing,
• pretender,
• creature,