Scout: Gunrunner
I think gunrunner is pretty good, buuuut
Cybersuit + Toxiberos's Tusk + Cold mod 
made the 2nd half of the game ultra easy
It worked well with gunrunner because I could shoot, then run away
before things could react
and just kite until they died
anyhow! Sometimes you get lucky. 
My other gunrunner game is probably enough to judge this ok...

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Kitchen Ace, level 15 Scout,
defeated the Harbinger against all odds.

He survived for 12320 turns.
The run time was 2h 8m 43s.
World seed was 3567.
He scored 6774 points.
He was ULTRAVIOLENT!

CALLISTO L2 -> Valhalla Terminal L1
Valhalla Terminal L3 - Lockdown
Valhalla Terminal L3 -> Valhalla Command
Valhalla Command - Cleared!
EUROPA L2 -> Europa Dig Zone L1
Europa Dig Zone L3 - Exalted Summons
Europa Dig Zone L3 -> Tyre Outpost
Tyre Outpost - found Cybersuit
Tyre Outpost - Cleared!
IO L2 - Infestation
IO L5 -> Infernal Lock
Infernal Lock - Cleared!
Dante Station L2 - Exalted Summons

Awards
  CRI Star (silver cluster) (+100)
   * 50+ kills without taking damage

He killed 716 out of 752 enemies.

 60 former grunts           12 security sentries
 12 corrupted grunts        4  military sentries
 1  former CRI grunt        22 CalSec bots
 14 former soldiers         8  security bots
 22 corrupted soldiers      2  military bots
 6  hellish soldiers        4  guardian bots
 7  former CRI soldiers     13 reavers
 4  former sergeants        17 cryoreavers
 6  corrupted sergeants     12 toxic reavers
 1  hellish sergeant        26 archreavers
 3  former CRI sergeants    8  kerberi
 25 former guards           12 cyberi
 4  corrupted guards        11 cryoberi
 2  CRI guards              12 toxiberi
 6  former commandoes       12 medusae
 16 corrupted commandoes    5  archmedusae
 2  hellish commandoes      17 ravagers
 10 former CRI commandoes   13 armored ravagers
 7  corrupted heavies       9  siege ravagers
 3  hellish heavies         4  plasma ravagers
 11 security drones         18 CRI marines
 6  combat drones           9  CRI bots
 70 fiends                  11 guardians
 17 fire fiends             6  sentinels
 24 ice fiends              3  warlocks
 9  toxic fiends            3  archwarlocks
 12 CalSec sentries

Traits
  Skilled L2
  Eagle Eye L1
  Dash L2
  Hellrunner L2
  Hoarder L1
  Dodgemaster L2
  Whizkid L1
  GUNRUNNER L3

Trait order
  Skl->Skl->Das->EE->Hr->Hor->MGU->Hr->
  Dm->MGU->Whk->Dm->MGU->Das

Equipment
  Slot #1 : CRI hyperblaster AV
   * Calibrated 1
   * Vampiric 3
   * Spin-up

  Slot #2 : AV2 7.62 assault rifle +C
   * Auto-calibrated
   * Freezing 2
   * Fresh Mag 3
   * Hunter 3

  Slot #3 : 12ga jackhammer B
   * Swap Harness
   * Calibrated 2
   * Jackhammer

  Body    : Cybersuit P2B2A2
   * Pockets
   * Fire-resistant
   * Acid shield
   * Durable
   * Swift
   * Carrier

  Head    : combat helmet P2BA
   * Plated
   * Long-range tracking
   * Danger Monitor
   * Bot scanner

  Utility : AV3 utility AMP
   * Carrier
   * Silent

  Relic   : toxiberos's tusk
   * Black Death


Inventory
  energy cell (x100)
  energy cell (x100)
  12ga shell (x50)
  12ga shell (x39)
  7.62 ammo (x100)
  7.62 ammo (x82)
  gas grenade (x3)
  EMP grenade (x2)
  multitool (x2)
  military stimpack
  military stimpack
  large medkit