Invisibility followed by air throw is okay.
If you're mid-screen you should use the A and B bugs first to lock the opponent down instead of using the C and D bugs, if they try to back off you can lock them down with bugs and then do a wall teleport to get next to them.
Arakune's worst matchups are Lambda, Mu, Hazama, probably Rachel and Taokaka.
if you can predict the burst what you're supposed to do next relies a ton about the timing of the burst, or if you blocked it or not, if you're able to you should go for 6B bug>5CDbugs, since the B bug is the fastest one of the bunch.