alt
alternative
the one-line answer
Alternative. A secondary account or an alternative aesthetic.
Alt has two main internet meanings. An alt account is a secondary account. Alt as an aesthetic means alternative culture, dark or edgy aesthetics.
mainstream
Your coworker might use this word.
01 / in the wild
hear it move.
description
she has a very alt aesthetic. all black everything.
She has an alternative, darker personal style.