A cosmetic item has no effect on gameplay beyond its appearance.
Usually superseded visuals of combat equipment(alternatively restricted to neutral zones). Cash Shop items should be typically of this category.
1.Visual equipment. Typically customized by player.
1a.Transforms consumables/artifacts. Transforms player into NPC or changes species.
1b.Dyes/Colors. Transforms existing equipment.
2.Minion item. Grants a visual minion/pet.
2a.Interactive/evolving pets.
3.Visual Effect generator. Grants particle effect/aura/glow.
4.Chat effect. Grants special emote/pose/roleplay actions.