If you're going for the perfect 4k5 score (kill everyone in 5 rounds and finishing with max HP), the easiest carry for this specific SA imo is Edo Deidara. He's a bit p2w for lowbies, but most average players have him by now. His breakthroughs are recommended but it could be done without. The reason behind this decision is because Deid hits hard, and his spiders are useful. Next, Edo Deid needs a support that can give him 2 standards for maximum dmg output, so that means Edo Jinpachi (or Kakuzu eGF sb for the p2w). The easiest main character for the job is water main (heals/poison/chakras for Edo Deid in case he's not fully sb), but Earth main could potentially work if you have Katsuyu lv3 summon mystery. Last slot can be anyone who can deals extra dmg, or remove debuffs, or buff dmg, so Edo Sasori, Edo Hiruzen, Asuma WB, etc.

The strategy is quite straight forward, Deidara being buffed and given double standard will ensure each wave only takes 1 round, feel free to deal extra dmg with other characters if that's not the case. Use debuff removal to prevent HP lost, and time your heals to ensure your own team is at max HP by the end of the last wave. Easy perfect score.