#tool arms

This Transformation type Quirk allows the user to grow out and shape their flesh. The user can then turn this into various inanimate objects, such as tools, weapons, and armor. This process refines and augments the tool in question. This is formed from the user's own biomass and gives it an organic look. These tools can vary in size or shape, such as making one as big as the user. These additions can be applied to the user's body or extended out from themselves on tendrils they make. For example, making a sword would be crafted from bone and sinew, but still cut as well as a regular blade. The user can make several of these, both of themselves or at the end of tendrils they control. This gives the user a versatile Quirk, able to build their body into and shape they see fit. They can battle enemies with different weapons, covers themselves in armor for protection, form new tools on the fly, adapt and augment their bodies with new additions, or just freak people out with their weird body. Though this is still part of the user's body, meaning that it getting hit can still be painful for the user. The user cannot make anything that complicated, such as a chainsaw, and cannot make too much of it without temporarily losing parts of their body.

This Transformation type Quirk allows the user to cover their body in a thin metallic shell. This helps to protect the user from harm, able to withstand gunshots without breaking. The user can form and morph this armor into various tools. This can be anything from simple as hammers to complex as jackhammers. The user can make these out of any part of their body, like making a chainsaw on their leg. This gives the user a good mix of options, with their malleable cover giving them plenty of offense, defense, and utility. They can battle enemies with their various instruments, block income against them, pound through debris disaster zones, augment their close combat abilities, or just never need to buy tools again. Though the user's metal cover is quite soft and malleable, meaning that it can break under less stress than regular steel. Moving around the cover can end up leaving parts of the user exposed to being harmed, especially if they make too many.

Super Regeneration, Meatball, Dupli Arms, Muscle Augmentation: This is for your eldritch horror. A mass of every changing flesh constantly splitting off and growing more extremities. Any attempts to harm it is next to futile as it's constantly shifting and healing. And if it touches you, it can mold you into horrific shapes, barely recognizable as human. It's like all the worst parts of the Thing.

Super Regeneration: Essentially just sit between what "Tool Arms" and "Transforming Arms" are doing. Maybe with some help from "Warping" to get them into place. With any luck, you'll come out of that grievously wounded from the various sources of damage and all the better for it because you can grow your parts back even faster.

-Arbor/Vines: I think that making your own plant work could do a lot to enhance whatever it your developing while still having it look natural. Plus, gardening is hard work and these could help you fact it till you make it.

I really can't answer the first question, as there isn't anything to confirm or deny that idea. The fact that the Nomu only seems to make hand-held tools implies that it can't, but maybe it could do something like that as an evolution by fusing arms. And while the extra arms may simply be a combination, I think it's just how the Quirk manifests. It is true that Quirks only grant the user one power, but there can be expansions. Normally, this comes in the form of secondary abilities that work as protections for the user or expansions on the core idea functions, but there can be cases where an ability can manifest in ways that make the power more useful. For example, "Tool Arms" is the power to make various tools from the user's body. That is the main concept and the only power it has. It's just that way it manifests as a series of extra arms from the user's back, extending their range and the number of tools they can make.

-Warping: Given Izuku's tactical abilities, giving him the power to move around allies and people nearby them would make for an amazing combination, kind of like how Magne's power could have been used. And if I had to choose any sort of personality focused pick, this would be the one. It's a very selfless power, only working to support allies and working with Izuku's supernatural ability to endear himself to anyone.

This Transformation type Quirk activates whenever the user makes contact with another solid. The user can then shove that solid into their body and store it inside of them. This does nothing to alter the user's size or mass. The user can then form arms from their body wielding whatever it was they placed in their body. The items in question are more efficient, such as having a screwdriver on the end of one of these arms that can rapidly unscrew things faster then a drill. These arms can extend themselves over short range and the user can make up to ten of them at a time. The user can take in multiples of the same items to use with different arms. This gives the user a versatile ability, turning random objects into tools to augment themselves. They can make large shields for themselves, battle foes with a variety of weapons, carry around certain items for utility, switch up their strategy on the fly, or simply enjoy the convenience of having multiple arms. Though this only works on solids and cannot be applied to people or overly complex items like power tools. The user has a limited spaced to work with, only capable of working with roughly twenty handheld items. The items can be beaten out of the user with enough force.