I've been reading this discussion about anime avatars since I joined Second Life. Some people are really paranoid.
I've used anime avatar for years, as well as several friends of mine. We have visited dozens or hundreds of Adult sims in this time, many of them with explicit content, and shared space with many normies who may have reasons to report us if they have the mentality of "anime = child = report". Nothing happened to any of us in all this time, and the reason is simple: being anime doesn't make you a child.
You can make an anime avatar that doesn't look like a child (which is, in fact, the vast majority of cases), as well as you can make an anime avatar that looks like a child. One thing is not linked to the other. The same way, being cute/kawaii doesn't make you a child avatar either, and I can give the same example of sharing space with cute/kawaii avatars for years and nothing happened to them because they, simply, are not child avatars.
A child avatar is clearly a child avatar. Just search "child" in the marketplace, there you will see how a child avatar looks like. And get rid of that paranoid that pursues you for years.