Modifiers matching neutral:

• new,
• pale,
• urban,
• dark,
• abundant,
• soft,
• natural,
• warm,
• earthy,
• energetic,
• impartial,
• small,

Simple categories matching impartial:

• professional,
• entity,
• observer,
• body,
• institution,
• commentator,
• party,
• agency,
• organisation,
• group,
• neutral,
• consultant,
• person,
• authorities,