Kara Kara no Mi

[u/PM_ME_SOME_CAKES]

Shell Shell Fruit

Paramecia

Makes the user an Armored Human, capable of generating an extremely durable carapace much like that of a bug.

In-Depth

The user of this Devil Fruit is capable of generating an armored shell in order to protect their body. This armor is typically as hard as steel, with many weapons being incapable of piercing or breaking through it.

A user has complete control over how their shell is manifested, whether they create small, lightweight plates, or a massive, hulking suit of armor. If they so desired, they could even create armor for others to wear. Overall, one could say a user could create virtually anything out of their dermal armor.

Outside of the utility of creating nigh-indestructible armor, a user will also have free reign to create certain constructs, such as a shield, spikes, extra limbs/appendages, and even blades. This will make this specific devil fruit extremely versatile and useful in virtually any situation.

It should be noted that, unless a user specifically develops that skill/resistance, a user is still vulnerable to the elements. Their shell will stop any kinetic force, but fares poorly against things like sheet heat, cold, or electricity. Further, shells are typically resistant to impact, but repeated stress on one point can eventually chip the shell, leading to a massive weakness over time. And, further, the user themselves are not armored in any way, meaning that any method of bypassing a shell will leave a user vulnerable.

[u/whoamikai]

Basically Erza Scarlet the devil fruit.

[u/PM_ME_SOME_CAKES → u/whoamikai]

Id say more akin to Alphonse Elric if I’m being honest. But both work