Im not sure if anyone realized this, but Onaga is at a set difficulty. It does not matter whether you beat him on novice or max difficulty setting because he still does the same cheap tactics and gets the same amount of damage done to him when you weaken him with a kamidogu. I realized while playing this.
What I did was, i played with one character (namely Raiden) on Easy and killed Onaga...but it was rather annoying. I then went to hard difficulty, and had some trouble with Noob-Smoke. Cleared him eventually, but Onaga was again, at the same difficulty...he doesnt change in my opinion....the best way to kill him is with someone with a strong and LONG combo, preferrably Raiden or Shujinko. As soon as you hit a kamidogu he weakens and you can do more damage to him with a combo...took off half his life with a 'Jinko combo...
What I did was, i played with one character (namely Raiden) on Easy and killed Onaga...but it was rather annoying. I then went to hard difficulty, and had some trouble with Noob-Smoke. Cleared him eventually, but Onaga was again, at the same difficulty...he doesnt change in my opinion....the best way to kill him is with someone with a strong and LONG combo, preferrably Raiden or Shujinko. As soon as you hit a kamidogu he weakens and you can do more damage to him with a combo...took off half his life with a 'Jinko combo...