iruka is preety much irreplaceable ..not only he has intrerupt and a shield for most ninjas and main characters he also boosts dmg and has a 10 hit chase ... from world boss / group summon battle he is the best booster ninja u could use ..otherwise u could try Ao with water main since he has intrerupt,sshield and boosts water ninjas or jugo for a cursed mark team (usually lightning main sasuke,kimmimaro,jugo or earth main, neji,yamato,kimmimaro) or konan for a pain team since pains boost each other and konan shields them all but your main won`t benefit of any of the buffs/shields unless u use iruka or Ao with water main.