Ichigo Kurosaki is the protagonist of Bleach. He's possibly one of the most overpowered protagonists in Shonen manga, given that he has powers from nearly every faction in the manga. In the final arc of the series, Ichigo is so focused on reaching the main villain, Yhwach, that he had little to no time fighting the other Quincy.
This makes fans wonder which Quincy he would have won against if he had been given enough time to fight each one. Ichigo may have been powerful enough to face Yhwach, but each Quincy has their own unique abilities, which may give them an edge against him.
10 Could Beat: Giselle Gewelle
Although she may look harmless, anyone who comes into contact with Giselle's blood immediately becomes a zombie under her control. These zombies are forced to do anything she orders. However, the manga mentions that this ability does not affect Quincy unless they are already dead. Ichigo would be one of the people that her power would not work on since he absorbed some of the reiatsu from another Quincy named Quilge Opie. This awoke his latent Quincy abilities that he inherited from his mother.
9 Would Lose To: Pernida Parnkgjas
Also known as the Soul King's left hand, Pernida has the ability to evolve by coming into contact with his enemy. He can use the knowledge he gains by touching the enemy to evolve, replicating both the enemy's abilities and strength. Pernida can also rapidly regenerate entire limbs or shoot his nerves into his opponents to control their movements. Pernida is one of the most terrifying Quincy enemies, and even Kenpachi Zaraki quickly lost.
8 Could Beat: Pepe Waccabrada
Pepe's power is strong enough to override Giselle's ability to zombify her targets. By hitting his target with a heart-shaped beam, he can make them fall in love with him, to the point where they would do anything he askes. Since his ability affects anything with a soul, he can also make a Zanpakuto fall in love with him.
However, Ichigo's bankai greatly heightens his speed, so Pepe is doubtful to hit him. If he happened to hit Ichigo's Zanpakuto, it wouldn't have the kind of outcome Pepe would want, especially since Ichigo has two of them.
7 Would Lose To: Guenael Lee
Guenael has many useful abilities. He can make himself invisible, make himself intangible, and even make it so that he enemy forgets about his entire existence. This makes him a deadly opponent, as his enemies get confused and disoriented when they forget all about him. When using any of these abilities, he can launch a sneak attack. He may not be solid, as his fight with Yachiru Kusajishi nearly ended badly for him, but that's because she has the same bloodthirsty instinct as Kenpachi Zaraki.
6 Could Beat: Cang Du
Cang Du refers to himself as "The Iron" because he can cover his body with a nearly impenetrable layer of iron. He also has the power to launch energy blasts at the enemy. However, both of these things would be easily countered by Ichigo's ability, Getsuga Tensho, which launches a crescent shaped slash attack at the enemy. It was strong enough to force the Quincy leader backward, so it would undoubtedly make swift work of Cang Du's armor as well as cancel out his attacks.
5 Would Lose To: Gerard Valkyrie
Gerard has the ability to make miracles happen. If he notices that something is unlikely to happen, then it miraculously happens. Commenting that a win against multiple Shinigami Captains would be impossible suddenly made it possible.
Additionally, Gerard can absorb the attacks he receives, converting the damage into increased size, strength, and defense. He can turn an enemy's power against them, making it unlikely for Ichigo to win by himself.
4 Could Beat: Driscoll Berci
Driscoll has the ability to grow stronger with each opponent he kills, but it would hardly help him against a fight against Ichigo. He can create weapons using reishi, such as brass knuckles, and even create long arrows that he throws like a spear. Neither weapon would be particularly effective against Ichigo's two swords, especially the arrows that take time to wind up. Ichigo's speed would outmatch Driscoll's, resulting in a quick victory for Ichigo.
3 Would Lose To: As Nodt
As Nodt has the ability to instill fear into his opponents by hitting them with thorns. This forces the opponent to see what they fear most. For Ichigo, that would be losing his ability to protect his loved ones. When faced with his fear by temporarily losing his power in both the Xcution arc and the Thousand Year Blood War arc, Ichigo caved in to a sense of hopelessness, which only his friends were able to pull him out of. Even though Ichigo would be strong enough to resist the ability more effectively than Rukia Kuchiki, Nodt would still have the upper hand.
2 Could Beat: Robert Accutrone
Robert is one of the best marksmen out of all of the Quincy, capable of hitting a target even when he isn't looking at it. However, during a very brief encounter, Ichigo was able to evade Robert's attack despite being in point-blank range. Robert does have the ability to run and fly at high speeds, making him one of the few Quincy who may be able to react to Ichigo's movements, but if Robert missed one, it's not likely he would be able to land a hit on Ichigo.
1 Would Lose To: Gremmy Thoumeaux
Gremmy Thoumeaux is one of the strongest Quincy in the series, making him capable of defeating Vice-Captain Yachiru Kusajishi in a heartbeat. He is even able to stand toe to toe with Captain Kenpachi Zaraki. Anything that he imagines becomes reality: in an instant, he turned Yachiru's bones into cookies, rendering her incapable of moving. By cloning himself, his power becomes stronger, even allowing him to create a giant meteor. The only way his power can be interrupted is if something else distracts him, which isn't likely in a battle against one person.