Blood-Blood Fruit (Paramecia)

Description: The Blood-Blood Fruit grants the user control over their own blood, turning them into a Blood Controlling Human. This enables the user to manipulate, shape, and harden the blood into various forms for both offensive and defensive. As the user's physical strength and stamina increase, their body adapts by producing more blood cells to meet the demands of their enhanced endurance and power. This adaptation is amplified by the Blood-Blood Fruit, causing their blood volume to double, which allows them to control and manipulate larger amounts of blood. This enables them to sustain longer battles and use powerful techniques without exhausting their reserves as quickly. However, it is still possible to deplete the blood reserve even if it doubles. Mastery of the fruit also improves the speed at which they shape and control the blood, enhancing the responsiveness of their abilities. It also enhances the durability of the blood constructs.

Abilities:

Self-Blood Manipulation: The user can only manipulate their own blood, shaping it into weapons, shields, or other constructs. 

Blood Shaping and Hardening: The user can transform their blood into various shapes and harden it. It can be used with Haki, especially Armament.

Awakening: [TBA]

Weaknesses:

Seawater Vulnerability: Like all Devil Fruit users, the individual is permanently weakened by seawater and loses the ability to swim.

Blood Loss: Excessive use of blood-based techniques without retracting the blood into the body leads to blood loss, causing anemia. The user becomes dizzy, fatigued, and can lose consciousness as their blood supply depletes.

High Food Intake and Long Rest: To replenish depleted blood, the user needs a substantial food intake and extended rest.

Techniques:

Blood Flow: This foundational technique allows the user to control the flow, shape, and density of their blood. Later on, Erwin improved this technique, gaining the ability to adjust blood flow in different parts of the body, enhancing strength and speed in those areas. However, this technique consumes extra energy and oxygen, leaving the user out of breath and extremely hungry after prolonged use. (Kinda like Luffy's Gear 2)

Blood Sword: The user shapes their blood into a blade, making it as sharp and resilient as steel.

The rest is TBA (To Be Added)

Note: I like keeping things simple, so there will be no controlling blood temperature, other's blood, iron inside the blood, etc... Too many things to focus on if I include those. The core abilities are Manipulate, Shape, and Harden of the user's own blood.