This one was looking fairly well, it was a lucky character with no hellish caves, and decent weaponry and kits. 
I finally decided to give a shot to rocket combat and I think it is really useful! One of the funniest moments was when I got an invul globe and I got to fry about 6 arachnotrons using rockets :p sweeet!
Still too coward to face the wall... I always lose promising characters to it
Then I arrived hells arena, bad thing I only had a green armor... but the kits made a victory seem possible. I had only one cat eye so cybie hit me twice before I got to BFG him, two times, then... I tried to shoot again... it always happens to me... then I was dead
I had 4 fully charged plasma rifles, 100 cells and 3 large medpacks when I died, hope the next marine finds a better use for them.
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 DoomRL (v.0.9.8 (WIN-S)) roguelike post-mortem character dump
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 Lt Valentin, level 6 soldier, killed by a Cyberdemon
 on level 20 of the Phobos base. 
 He survived 67363 turns and scored 24226 points. 
 He killed 304 out of 386 hellspawn. (79%)
 He found the Phobos Arena. 
 He stormed the Chained Court. 
 He ventured into the Halls of Carnage. 
 He fought on Hell's Arena.
 He faced The Wall.
-- Statistics ------------------------------------------------
  Health -2/60   Experience 19499/6
  ToHit +0  ToDmg Ranged +0  ToDmg Melee +0
-- Traits ----------------------------------------------------
    Ironman        (Level 1)
    Hellrunner     (Level 1)
    Tough as nails (Level 3)
    Cateye         (Level 1)
-- Equipment -------------------------------------------------
    [a] [ Armor      ]   green armor [0/1] (38%)    
 [ Weapon     ]   BFG 9000 (8d8) [20/100]
    [c] [ Boots      ]   plasteel boots [8/8] (76%)
-- Inventory -------------------------------------------------
    [a] double shotgun (6d3)x2 [2/2]
     rocket launcher (4d4) [1/1]
    [c] chaingun (1d6)x5 [0/50]
    [d] plasma rifle (1d8)x8 [40/40]
    [e] plasma rifle (1d8)x8 [40/40]
    [f] plasma rifle (1d8)x8 [40/40]
    [g] plasma rifle (1d8)x8 [40/40]
    [h] combat shotgun (6d3) [5/5]
     10mm ammo (x100)
    [j] shotgun shell (x13)
    [k] shotgun shell (x50)
    [l] rocket (x5)
    [m] power cell (x50)
    [n] power cell (x50)
    [p] large med-pack
    [q] large med-pack
    [r] large med-pack
-- Kills -----------------------------------------------------
    49 former humans
    43 former human sergeants
    17 former human captains
    31 imps
    51 demons
    34 lost souls
    17 cacodemons
    6 barons of hell
    7 hell knights
    9 arachnotrons
    4 former human commanders
-- History ---------------------------------------------------
 He started his journey on the suface of Phobos.
 On level 2 he battled through a maze of rooms.
 Afterwards he fought on Hell's Arena.
 On level 3 he found hellish caves.
 On level 4 he found hellish caves.
 He then stormed the Chained Court.
 On level 5 he battled through a maze of rooms.
 On level 6 he battled through a maze of rooms.
 On level 7 he found hellish caves.
 On level 8 he battled through a maze of rooms.
 On level 9 he battled through a maze of rooms.
 On level 10 he battled through a maze of rooms.
 Afterwards he witnessed the Wall.
 On level 11 he battled through a maze of rooms.
 He then ventured into the Halls of Carnage.
 On level 12 he found hellish caves.
 On level 13 he battled through a maze of rooms.
 On level 14 he battled through a maze of rooms.
 On level 15 he battled through a maze of rooms.
 On level 16 he found hellish caves.
 On level 17 he found hellish caves.
 On level 18 he battled through a maze of rooms.
 On level 19 he battled through a maze of rooms.
 Then at last he found the Phobos Arena.
 There finally he was killed by a Cyberdemon.
-- General ---------------------------------------------------
 Before him 54 brave souls have ventured into Phobos:
 51 of those were killed.
 And 3 couldn't handle the stress and commited a stupid suicide.
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