Ruos
Crystal Fruit – The special lodge has the ability to control, generate, and manipulate crystal at will, as well as crystallize any substance, but what makes this fruit special apart from other lodges is that it has the ability to absorb the solar energy, which gives him greater resistance Improved speed, reflexes and regeneration but not only that with his solar energy he can store it in energy that he can shoot from his body like the fruit of light and He also has an ability very similar to Katakuri's sister fruit that allows him to have a dimension of mirrors but the difference that instead of the mirror fruit is a dimension of crystal. PD welcome to home
author, I would choose the fruit of the barrier, not to make the MC Op too fast with a logia, also for giving fun forms of attacks and defenses, showing the MC learning to use it and not make him instantly Op with logia effect, making him invincible for a good part of the work, but with the barrier he can become beatable but with an "impenetrable" defense at least during good part of the grand line (sorry if there are any spelling mistakes, I'm writing through the translator, hope you understand what I mean)