Can i be polyam, aro, and demisexual?
Yep!
It’s fairly uncontroversial that someone can be both aromantic and demisexual. Perhaps a little more confusing is being demisexual and polyamorous, but there’s nothing about being demisexual that means that you can’t be polyamorous and demisexual polyam people definitely exist.
Some people are confused by the idea of someone being both aromantic and polyamorous, but it makes sense to me that they’re compatible. Some aros are interested in queerplatonic relationships, and there’s nothing about a queerplatonic relationship that says it has to involve exactly two people. Also, some aros like having sex, and of those aros, some of them are interested in having multiple informed and consenting partners. You can take either of those ideas of how an aro could by polyam and add demisexuality into the mix and it still makes sense, so there isn’t any reason someone couldn’t be polyam, aro, and demisexual.