Really depends on a lot of tgings. Are you into heavy, nedium or light armot? Do you want to be agility A B or C dtc.
If you into fire, go with Warrior of the West, Bow, Sword and Head piece for ccd bonus, and Red Demon 5 pieces, spear, chest, gloves, legs and boots. All that plus yasakani magatana. Red Demon will give you ccd, damage to scorched and ki recovery, pair this with kato primary and komori secondary. As a second ranged weapon use Hand cannon with 30% fire damage and Agility A bonus. Roll on the Spear and Sword ccd +20%, familiarity damage A, change to attack (of your choice) to A+or AA. Add damage to scorched enemies on both weapons, I think 25% is the max and with Red Demon you will have 60% extra damage to scorched. +15% scorched status for facter scorching. The sword us water baded so you gonna have to infuse it with fire talismans. You can also get +% fire damage on accessories if you're lucky.
At least that's what I would do if I was into fire