the mixup off of a fuzzy guard is usually high/low. either j.B and then jumpcancel into a second one, or j.B and then land and 2B/renka.
in this case though, if IB makes the second j.B less than airtight, you can just jumpcancel and do hotaru instead, since they have to respect it and block it because it beats everything lol.
anti-air? air IB is +10, you have hotaru, j.B, j.C, j.2C, j.D, an airthrow with ridiculous range and one of the best airdashes in the game; you have nothing to be afraid of, lol.