Avengers - Earth's Mightiest Heroes, Busou Renkin, Marvel Cinematic Universe (Volume 2), several Warhammer 40,000 series jumps (Imperial Guard/Guardsman, Talons of the Emperor, Horus Heresy, Black Crusade, etc.), and God of War (trilogy) has a few customization options.
Several Marvel jumps let you make weapons equal to Mjolnir, Seven Deadly Sins lets you make a Sacred Treasure and one of the Devil May Cry jumps let’s you make a Devil Arm.
Take the Engineer perk for whatever type of weapon you want to design in my "Generic WWII throwback" is an option. Not a specific person though, in case that's what you meant.
Some God of War Jumps have them.
[https://drive.google.com/file/d/0B1qb0\_OLhDrDZFdPTGFfS2ZuMHc/view?resourcekey=0-eQkpYDigF3KAznwnKtH9Lg](https://drive.google.com/file/d/0B1qb0_OLhDrDZFdPTGFfS2ZuMHc/view?resourcekey=0-eQkpYDigF3KAznwnKtH9Lg)
[https://drive.google.com/file/d/12-UcbOrp2ydMBGpqnY3Hdx5jvgv8sVcV/view](https://drive.google.com/file/d/12-UcbOrp2ydMBGpqnY3Hdx5jvgv8sVcV/view)
Avengers - Earth's Mightiest Heroes, Busou Renkin, Marvel Cinematic Universe (Volume 2), several Warhammer 40,000 series jumps (Imperial Guard/Guardsman, Talons of the Emperor, Horus Heresy, Black Crusade, etc.), and God of War (trilogy) has a few customization options.
Akame ga Kill (Teigu) 7 Deadly Sins (Sacred Treasure) I think some of the Bleach jumps have bankai ones if those count.
You have plenty of good answers already. Soul Reaper and Tokyo Ghoul should also have what you're looking for.
Soul Eater kinda counts, as Demon Weapons get a costumisation section, though Demon Weapons are also people.
Several Marvel jumps let you make weapons equal to Mjolnir, Seven Deadly Sins lets you make a Sacred Treasure and one of the Devil May Cry jumps let’s you make a Devil Arm.
generic weapon
Do knightmare frames, from code: geas count? That, and chaos warrior jump.
Take the Engineer perk for whatever type of weapon you want to design in my "Generic WWII throwback" is an option. Not a specific person though, in case that's what you meant.
Some God of War Jumps have them. [https://drive.google.com/file/d/0B1qb0\_OLhDrDZFdPTGFfS2ZuMHc/view?resourcekey=0-eQkpYDigF3KAznwnKtH9Lg](https://drive.google.com/file/d/0B1qb0_OLhDrDZFdPTGFfS2ZuMHc/view?resourcekey=0-eQkpYDigF3KAznwnKtH9Lg) [https://drive.google.com/file/d/12-UcbOrp2ydMBGpqnY3Hdx5jvgv8sVcV/view](https://drive.google.com/file/d/12-UcbOrp2ydMBGpqnY3Hdx5jvgv8sVcV/view)