That team is no longer unstoppable. I use the Roshi/Fuguki/Kurenai team and 90% of Roshi/Han teams lose to it and I'd still have above 50% team hp left.
The moment Sailor does standard attack and gets ignited, it's over.. Totally over, after Fuguki unleashes mystery on ignited sailor. The enemy team will enter round 2 with sailor at 10% hp or less, you time your roshi mystery properly so it won't get interrupted. After the enemy combos on either fuguki or roshi, say goodbye to them. You either finish off sailor or interrupt enemy azure's mystery with roshi's mystery. I lose only to those who have ungodly amounts of initiative that even the enemy azure is faster than my roshi.

I could only advise op to try and get some hidden mist ninjas and run a root team with edo sasori. Kushimaru, Jinpachi, Edo Sasori. Doesn't matter if enemy has Han, that team does Jinpachi round 1 mystery + ignite, double standard attack from jinpachi, another double standard attack from sasori. Jinpachi clears debuffs off of edo ninjas.

Another thing is to run mei, chojuro and mangetsu team with chojuro at move 1, buffed by magetsu, mei and azure.. Chojuro gains a single evasion buff plus truck-like standard damage. This team, though, isn't half as strong as the ones I mentioned previously.

I'm glad I listened to the people on this forum and didn't go for Han. It's a one-sided battle if you face an azure or wind main running Fuguki/Roshi/Kurenai, no other way to win vs them using Han/Roshi.

Just got it this morning. No Han/Roshi teams ever survived.

This team isn't unstoppable at all. I lose many times to Shisui/Fire main immunity teams. Also lost to pure cloud blitz teams, but I win if the enemy makes the slightest mistakes. A fire main that delays his immunity shield and finishes his standard attack will get mauled by Fuguki. Unfortunately, my enemies learn fast and they cast immunity first at the beginning. If enemy has no sort of immunity or hard CC, it's basically over for them. The poison tai + ignition just deals too much dmg.

No. I was saying get a team of Kushimaru/Jinpachi/Edo Sasori. That team is strong enough with the round 1 team ignite and 3x standard attack. It won't be as easy though if you face a shark kisame enemy blitz team.

Try it for yourself and see a drama in world chat starting soon. Lol. You'd have to get used to it for some time, but once you get the hang of it, it's quite a steamroll.