3 Devil fruit idea/concept

WARNING! If you want to use this in a fanfic, I don't recommend the One Piece world as the MC will become OP VERY QUICKLY. So, I recommend this for more dangerous worlds, cultivation worlds or multiverse travel. I personally like the enhancement, healing/vitality, curse, and mental aura the most so I gave a more detailed description of those aura types. Other than aura amount/quantity, there is not a lot of limitation. P.S., it is very very OP, so its alright if someone wants to change things with this fruit. After all, the curse aura alone is strong enough to to be at the top, but keep in mind that it is not a logia.

Aura-Aura fruit

Appearance: like flame flame fruit but blue or white

Paramecia type

Can control aura and give it properties such as elemental properties (ex: burns like fire, but can only be put out by stopping the supply of aura, so it can't be put out by lack of oxygen)(cant give it properties of air and expect it to allow him to breath in space or underwater, but using healing aura to keep his body from dying in space/underwater is viable, but is demanding so to use it for a prolonged duration user must awaken devil fruit, even then it won't last for long) (can replicate the features/properties of other types of energy, which allows the user to replicate or use exclusive techniques that require certain types of energy, such as draconic energy or whatever, exception is if the user of said exclusive technique can turn ethereal or has an ethereal body, then it is most likely not applicable by the user) (can refine the energy in the world and turn it into aura to store it in his body, if you want to make a cultivation fanfic)

Both physical and mental/haki/energy/mana/spirit training can increase aura amount, aura control training can increase usage efficiency (starts off at 50%) (aura control is just how experienced the user is at controlling the aura, so it is not a measure of power, but mastery) (maximum is 100% at which no aura is wasted, but 98-100% is more realistic, after all the user is not a machine and can slip up and make slight mistakes)

Awakening the fruit triples the output which makes it use three times less energy amount for similar results, applies to all types of aura.

The user of this fruit is guaranteed to awaken haki with enough training, including conquerer haki

Aura types can be combined (ex: heal/mental recover mental fatigue and can heal mental trauma with multiple sessions, depending on how "injured" the mentality is)

Heal/Vitality heals physical injury, but to regrow parts, needs immense amount, otherwise requires a multitude of sessions to finish depending on the injury size. Can drain vitality to heal or strengthen recovery rate. IF previously healing can restore a human hand in 9 months, then after awakening it can be done in three months, if the aura amount doesn't change. I put emphasis on IF as the time will depend on the aura amount. (when the user is at the level of a strong marine captain, like smoker, re-growing a hand will take around five months) (possible application is, if someone is blind, the "damaged" part must be removed before using heal to regrow the part in an "undamaged" or healthy state, this can be applied to other parts) (recover stamina) (speed of healing depends on the aura amount)

Enhancement (body or/and object). Can be used with healing to enter "Battle Mode", at which the user is strengthened and is recovering constantly, which means more strength and theoretically infinite stamina regeneration as long as the aura supply is not cut off.

Curse aura includes corrosion, withering, toxic, disease, and others. (not actual disease but makes someone feel weak/sick). Toxic aura is not actual toxins but aura that replicates its properties.

The curse aura can function similarly to nen curses from HxH, which means that to put long lasting curses some of the aura the user has will be put aside for this curse, so unless the curse is broken by the user, some of the users aura will be put aside for maintaining this curse, leading to a decrease in the users aura capacity/tank. Curses such as withering/corrosion/decay can kill cancerous cells, damaged cells, harmful organisms OR material, or just for killing. Lust curse aura can replicate BIGRRA effects (f*ck the earth and the heavens!)

Mental (can control life forms with weaker mental strength, can't expect to make a normal tree to start moving, at most drop some leaves or fruits, if it has any, unless its a monster tree or something of the like) (controlling sea kings is obviously hard, comparable to a strong captain, such as Smoker, if the sea king is young, injured or weak) (can be combined with heal to fix mental injuries, if the problem is not physically based such as a deformed brain) (may take some time depending on the issue, it can help recover from mental fatigue) (can use with curse to corrode the mind or make someone go crazy, of course once the aura supply is cut off the target has a chance to recover if the damage was not severe or prolonged, otherwise has to be healed using the previous method)

Using stamina recovery and mental fatigue recovery can allow oneself to stay active 24/7, meaning more time for activities like training, or anything really. (depending on the degree of mental and physical fatigue, the amount of aura will vary, which means at first user can't be active 24/7)