Along with the new customizations with arcosians (horns for example) will arcosians's 2, 3 and forms onwards also have unique horn designs based on the ones you picked while customizing your arcos or will they be the same regardless of choice (P.S. I understand how difficult it is to make variants for each customizations in games so I understand if your base form horns don't affect them at all)
#Arco customization
sterile thorn
rare umbra
I BELIEVE Custom horns do effect the other forms, (with the exception of 5th form) HOWEVER I am not 100% sure, lil who worked on it or Rook/Munch could clarify it-