Are there any blue weapons?

[Duskyer]

For the sake of fashion hunting I need a blue weapon to match me. If no blue then I'll settle for pure black.

[Zhou Yu]

All off the top of my head, best weapon might be the Guardian Ebony Odogoron with black, blue, and white accents. Otherwise maybe Xu Wu with gold, black, and blue accents. After that maybe Guardian Fulgar Anjanath or Rompopolo. Iron tree might fill in for a "pure black" with its plain steel looks. There might be a non monster specific tree that also can fit for certain weapons, like para greatsword is all black except the very edge which is red. After that you got like black and purple with Gore Magala. Or black and red/orange with Balahara and Gypceros.

[Dj DNA]

Nu Udra has some blue

[Despell]

I dont think there is a weapon where the major part is blue but some have blueish accents:

Nu Udra
Xu Wu
Rey Dau (more leaning towards purple)
Rompopolo
Some guardian weapons like G Ebony Lance

if you are ok with purple Gore Magal would be a good choice

[Duskyer]

Thankies. I'll check em out later.

[NekoShade]

When/if Lunastra come to the game, she'll be a great source of blue gear.

[Hunter Iradan]

If/when subspecies appear, then Azure Rathalos gear.
If they bother to put his weapons.

[NekoShade]

Heheh, don't give me ideas, I always dreamed of a silver rathalos and a white fatalis in a modern monster hunter game.
Their gear were so epic in full 480x272 resolution back in the days.