Brotherhood

No, you don't have to make it +6. Brotherhood +1 already can give you the bonus. Because brotherhood cannot be crafted and you can only have one piece (same as Rain's sword). +6 is required only for crafted weapon that has +5 already.

You need to get one of its recipe and heartquartz from the second bingo board. Craft the recipe and don't forget to tick the box "use crafted equipment items as materials."

Lol imagine thinking wotv or ffbe is the origin of the sword or that gumi had anything to do with its original translation into "brotherhood"

Have you ever played any FF game other than the mobile versions to make such a 🔥ed comment?

The sword Tidus received from Wakka in FFX was named Brotherhood for the overseas version, and Fraternity on original FFX Japanese version. Gumi have nothing to do with it's name, it comes from the 2001 game FINAL FANTASY X, produced by SquareSoft for the PS2, and remastered in 2013.
Besides, I like brotherhood (maybe because I've played FFX in English, and never heard it's original name).

You should blame square enix rather than gumi, if this naming really annoy you. They made it into "Brotherhood" to make it more familiar with overseas market. This is why people should do some research before post anything online. I believe Tidus originally called ティーダ in original version

Fraternity means Brotherhood

"The homo subtext"? What are you talking about? Anyway, it's not called Fraternity. It's called Brotherhood. Maybe you don't yet own the weapon, so you don't know that.

There was kind of a localization scandal when there was an eva 2 screening years ago and they had khara representatives who were horrified the audience was laughing and felt the shinji kaworu scenes were misunderstood

Japanese creators in general have either complete detachment or anxiety over localization because it happens every few years

For me, both are right. In the original FFX (2001), and also it's remaster (2013), the japanese version had it named Fraternity, and the overseas version named Brotherhood.
I've played the overseas version of the game, so, Fraternity sounds a little bit strange for me when talking about Tidus weapon, but I like it too (like Tidus Caladbolg, called Ultima Weapon in Japanese ver).

no

I've been looking everywhere for recipes, but I can't find any. I think it might be just a one of...

Not sure if there's a name for the kind, but some weapons you just get one and you awaken it and level it up, like rain sword or agrias

It's a reward from one of the bingo challenge boards, not a crafted weapon

thanks!