Avatar Borders are a customization option in Honkai Impact 3rd, start from version 3.3 with the Season 1 - Combat Elite border.
Captains can customize their borders by taping at the avatar in profile.
Elite Battle Pass Borders[]
These can only be obtained by purchasing Elite version of Battle Pass
Season 1 - Combat Elite
Season 2 - Cadenza
Season 3 - English Nobility
Season 4 - Howling Thunder Fox
Season 5 - Heaven and Earth
Season 6 - Belt of Glory
Event Borders[]
Ruins Conqueror
Dirac Sea Explorer
Thorn Flower
Emerald Crown Ribbon
Login Borders[]
Pure Silver Merit
Solid Gold Albert
Other Borders[]
None
Breakthrough
Glory Star