I'll list my HUmar's and HUcast's weapons; I pretty much like all of them.
Master Shake, HUmar (Level 114):
God Hand +30 with 10/0/0/0/10 - better than Delsaber's Combo, and lets me equip a decent shield instead of that crappy Delsaber Shield.
Red Handgun +50 - reliable, rather powerful handgun.
Red Sword +52 - good for HUmars because of its power... it's about as powerful as the powered-up Delsaber's Buster.
Meteor Cudgel +15 - has the potential to be more powerful than a Demolition Comet, but its damage is variable. If you can find one with hit%, the special (freeze) becomes very valuable (I assume; mine has no percents :ermm: )
Flight Cutter +9 - cool looking, powerful slicer with a devil's special.
Twin Psychogun - the most powerful (ungrinded) and accurate non-srank mechguns a
HUmar or HUnewearl can equip.
KillCount++;, HUcast (Level 87)
Delsaber Combo - it's a reliable weapon for late VHard-early Ultimate, but I'm working on getting him a God Hand as well.
Red Handgun +20 with 15% hit - every HUcast could use some hit%, especially on their gun.

Demolition Comet +25 - everyone's favorite pipeable twin.

Red Partisan +10 - good for HUcasts because of the accuracy (as opposed to a Red Sword) and the Freeze special.
Red Slicer +25 - *shrug* it does the job.

Could have a better special though (fire? meh)
Gush Vulcan +5 with 25% hit - for stealing HP.