His j.5b which is dash cancel-able opens up a lot of options for arakunes pressure / combo game , also his j.2a b or c can open up a lot of options if its a counter hit. You can also go for his grab mix up game. Usually you shouldn't force combos with arakune , learning match up's is also an important part of his game. My suggestion is watch videos of what arakune does in situations and pay attention to how combos are started.