Well, in the original One Piece, Luffy's devil fruit powers are a huge part of his identity and his combat capabilities. But in this fanfiction, without the devil fruit, his physical strength and Haki would be emphasized more. His fights would be more about pure skill and strategy rather than relying on the strange and wonderful abilities of the Gum - Gum fruit.
Another possibility is a Devil Fruit that gives her the power of telepathy. Fem Luffy could then communicate with her crew without speaking, which would be very useful in stealth missions. She could also use it to read the minds of her enemies, getting an edge in battles. This would completely change the dynamics of her relationships with other characters in the story as well.
One interesting idea could be that Luffy has to rely solely on his Haki and physical training, making him even more of a badass in combat. He might develop unique fighting styles that we haven't seen in the original story where he had devil fruit powers.
If Fem Luffy had a different Devil Fruit, she might not have the stretchy body that makes her so recognizable. For example, if she had a Devil Fruit related to plants, she could grow vines from her body to grab enemies or create barriers. This would make her more of a strategic fighter, relying on the environment she can create rather than her physical strength alone.
Alright, the following is the order of appearance of all the aptitude users and demonic fruits in One Piece:
1 Luffy (Monkey D Luffy)--Rubberfruit (Rubberman)
2. Zoro-Fruit of Swordsmanship (Swordsman)
3. Nami--Sailor Fruit (Sailor)
4. Usopp--Sniper Fruit (Sniper)
5 Sanji-Chef's Fruit (Chef)
6. Chopper-Reindeer Fruit (Reindeer Master)
7. Franky--Boatsmith Fruit (Boatsmith)
8 Brook--Yellow Springs Fruit (Yellow Springs Warrior)
9. Jiro-Murloc Karate Fruit (Murloc Swordsman)
10 Very Fair (Zephyr)-Wind Fruit (Messenger of the Wind)
Renil--Admiral Fruit (Admiral)
12 Chopper, Nami, Usopp, Sanji, Franky, Brook, Jiro-Seven Martial Seas
The above is the order of appearance.
Alright, the following is the order of appearance of all the aptitude users and demonic fruits in One Piece:
1 Luffy (Monkey D Luffy)-rubber fruit
2. Rorono Zoro--Swordsmanship
3. Nami-Sailing
4. Usopp--Gunpowder, Gunpowder Fruit
5. Sanji-Sword Arts
6. Chopper-Ship Doctor
7 Franky-Boatsmith
8 Brook--Yellow Springs Fruit
9 Goronpa Goron--Demon's Wind Kick
10 Rorono Zoro--rubber anchor fruit
11 Reiner-One Piece's Mentor, Devil Fruit, One of the Devil Fruit Ability Users, Sword Master
12 Nami-Author of One Piece, Devil's Fruit, One of the Devil's Fruit Ability Users, the ability user who drew the world map
In One Piece, there were many people with powerful abilities, but two of them stood out. One of them was a Black Ghost. He was one of the most powerful captains. Although he had never eaten the Devil's Fruit, he had strong willpower and physical fitness. The other was Shen Ping. He was a Vice Admiral under the World Government. He had never eaten the Devil's Fruit, but he had extraordinary strength and brains. He was known as the "Navy's First Wise General." Although they did not have the ability of the Devil Fruit, they were still among the best in the pirate world. I hope you like this fairy's recommendation. Muah ~😗
One Piece's Demonic Fruit had a variety of abilities. The following were some of the main abilities:
[1. Rubberfruit (Rubberqi Fist): Turn your fist into rubber, giving it a strong elasticity that can easily send enemies flying or twisting them.]
2. Demon Fruit: Allows the user to transform into animals such as cats, dogs, lions, tigers, etc.
3. Fruit of All (Fruit of All): Allows the user to control the will of others and turn them into their slaves or assistants.
4. Demon Fruit: Allows the user to become a giant, such as possessing the strength of a giant.
5. Demonic Fruit: Allows the user to transform into a dragon such as Dragon's Breath or Dragon's Claw.
6. Devil Fruit: Allows the user to turn into a flaming person, such as a fire-type attack.
[7. Devil Fruit: Allows the user to become a superhuman, such as possessing superhuman strength or super speed.]
In addition, One Piece also had some special demonic fruits such as the demonic fruit, the time fruit, the demonic fruit, the spatial fruit, the demonic fruit, the magical beast fruit, and so on. These abilities were very powerful, but only a very small number of people possessed them.