Is it permissible to support or interact with Instagram accounts that post anime pictures and mention its name, given the possibility of indecent scenes and music in the original anime, even if the interaction is limited to answering direct questions without commenting on the anime itself?

Accounts whose majority of posts are forbidden should be denounced, not interacted with, out of fear of aiding their spread. As for accounts whose majority of posts are permissible, even if they occasionally post some forbidden content, there is no harm in participating in them with permissible interactions that do not involve spreading forbidden content.