You mean what summons should you go for?

Gamaken, lightning tiger, monkey king and dog of hell. I use basically only those 4 with azure fang teams.

there is no such this as 'good combos' there are good passives but combos are only for extra dmg, you have to create combos there is so set combos for mains

To get good combos, you will need to have good team, the right skills for that team and the right summon.

Well first, pick a ninja that you want to start your combos, either base on standard attack or base it off a mystery. (If you can fulfill both then that'd be amazing)

Second, build around that ninja with other ninjas that will chase off the ninja you're building around. Then have your mysteries cause the same condition as what you build around. Such as if the ninja you're building around causes Knock Down, find a ninja whose mystery will cause Knock Down.

Third, pick a summon (Gold preferred) that can be used in the middle of your chases and at the end if possible. It can help tie in your ninjas together to get a decent chase.

Example: Water Main, Hinata

For Hinata, I'll have my main chase Knock Down into High Float so Chakra Dissection Blade as its chase, then use my summon Lightning Tiger King to cause Repulse for Hinata to cause Knock Down.

Add Kabuto who also has Chakra Dissection Blade to chase the Knock Down into High Float.

Then the Main will come in again, causing Repulse. For this you c*e for example, Sage Naruto who will chase Repulse into Knock Down. So you'll see something like this.

Hinata causes Knock Down on standard attack -> Hinata chase Knock Down into Knock Down -> Water Main chase Knock Down into High Float ->Water Main chases High Float into Repulse using Lightning Tiger King -> Hinata chases Repulse into Knock Down -> Kabuto chases Knock Down into High Float -> Main chases High Float into Repulse using Lightning Tiger King -> Sage Naruto chases Repulse into Knock Down

Which is an 8 Chase Combo.

Of course with this Line Up we we c*e Rasenshuriken which causes repulse, so the chase goes like this.

Sage Naruto causes Repulse on Mystery -> Hinata chases Repulse causing Knock Down -> Hinata chases Knock Down into Knock Down -> Water Main chases Knock Down into High Float -> Water Main chases High Float into Repulse via Summon -> Sage Naruto chases Repulse causing Knock Down -> Kabuto chases Knock Down into High Float -> Water Main chases High Float into Repulse via Summon.

Another Chase 8 and considering you can change your main's mystery in this case, I can get an 8 Combo through Hinata's standard attack, Sage Naruto's Mystery, and Water Main's Super Shark Bomb mystery. Since it is 8 combos on either Repulse or Knock Down.

It is all about building around the core of your team which will consist of your Main and 1 Ninja that you pick. Of course you have to experiment a lot, but I'm sure you can find something :)