Brown eyes are the most common eye colour on Earth. That does not make it a trope, however, and it should not be listed on work pages.
Same for hazel eyes.
Sometimes, brown eyes may be a sign of the following tropes:
- Elemental Eye Colors, for when they match the character's elemental affinity. Usually associated with earth-based powers.
- Meaningful Appearance, for when the work or Word of God explicitly call them out as a sign of a character's trait.
Such examples should be listed under these tropes.