It would survive any fire jutsu other than Amaterasu. Not sure about Jinton though, if it covered all of its body then it would most likely kill it. But then again, not even Susanoo could survive Jinton...
But how it would survive any other fire jutsu if he'd be entirely covered? Normalf fire jutsu, of course, but one at a large scale I wonder...
He did have something similar to the slug splitting... everytime you split a part from him through cutting for example, another head appeared, lol. xd
The Kuybi is a pretty useful summon too, at least it would oblirate Katsuyu U_U
Of the more legit, I think Emna is very useful too. Would love to see him and Hiru at their strongest, they'd probably be boss.
Tbh, I will say this. You cannot define one summon to be more useful than another. It all depends on the summoner. Whoever makes the best pair with his summon, is probably the one that has the more useful summon U_U
Well it would seem that Kurama's corrosive chakra doesn't harm Katsuyu, and based on the fact that TBB works exactly like rasengan it should have no real affect on Katsuyu. Because Katsuyu can resist be torn to shreds clawing and biting her does no real good. So theoretically, the Kyuubi has no way to defeat her.
Um, I will reverse your argument as Katsuyu is immune to physical attacks.
Katsuyu's abilities:
Among Katsyuyu's abilities is the ability to divide into many versions of herself. Her full bodied self is capable of spitting acid so it is logical to assume that her minis could as well..
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Or given how Tsunade was able to heal the village through Katsuyu and she was going to kill Orochimaru with Medical Ninjutsu if a small katsuyu a few inches long is stuck on an opponent Tsunade needs only to channel the technique through Katsuya to kill an opponent. I can see Tsunade inacting this jutsu while multitasking as she always holds the jutsu that keeps her looking young, while using augmented monster strength, while using forbidden jutsus, or how she keeps up her technique while she heals.In addition to the obvious fact that Katsuyu can crush people. Given the crushing power of this mini katsuyu it only stands to reason the a full sized katsuyu would be much more deadly.
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We also know that Katsuyu can completely envelop people quickly even without their permission
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And Tsunade can seeming sense what Katsuyu sees
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Katsuyu can transfer information over multiple battlefields at once
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Logically a mini katsuyu like this one could stay with Tsunade and insert chakra into her to wake her from genjutsu
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Katsuyu cannot be harmed cutting or stabbing and as we've seen her withstand Shinra Tensei FP and Chibaku Tensei it is safe to assume she can withstand being crushed.
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It also a given fact that Katsuyu can withstand the Kyuubi's corrosive chakra that burns and poisons which seems to indicate she may be immune to burning and poisoning.
