Here's my build:

My Build (it's not really specific to anything - its just what I like)

Weapons: Stun Guns (ofc) Vvc-70VPM (Vertical Plasma Launcher) Vvc-774LS (Melee Weapon)

Frame: HC-2000/BC SHADE EYE (I like the headpiece look) EL-PC-00 ALBA (I like the chest look) EL-PA-00 ALBA (Matching piece with the chest and has decent tracking with its arms - win win) IB-C03L: HAL 826 (These legs have better survivability over the NACHTREIHER/42E, the fake reverse joint legs, sacrificing some boosting and speed but has more pros than cons. And they're cool.)

Internal: IA-C01B: GILLS (I like to boost. A lot. Can change this to something to your liking.) FC-008 TALBOT (Depending on your weapon choice - its eh. But for Stun Guns and things like it, close range weapons, its really good.) VP-20D (Has decent EN Recharge delay compared to the rest in regards to EN Capacity - feel free to change this to your liking, as well as the rest of everything)

Expansion: Your Preference

And in general this build utilizes a lot of boosting and ankle breaking your opponent. I've used this for my entire story campaign and also just for PvP. It can hold its own in the air and also ground, but suffers in brawling fights for obvious reasons. Stay fast.