ASCII art Katakana - no kanji codepage required! As noted by microlith, this is not romaji but a phonetic approximation.

   ---.   /    -+-.  ---   --+-
    |/   /|      /    |     /|
    |     |     /    ---   / |
    ah    ee    ü    eh     o
                                
   -+-.  -+-   /--.  /---  ---
    | |  -+-     /     |     |
    | /   |     /     /    ---
    kah  kee   kü    keh    ko
                               
   -++-  - /   --.   -+-.  | /
    ||   -/     /     |     /
     /   /     /\     '-   /
    sah  she   sü    seh    so
                                   
   /--.  -+-   ||/   ---   |
    ./   -+-    /    -+-   |\
    /`   /     /     /     | \
   tah  tchee  tsü   teh   tow
                                   
    |    ---   ---.  --      /
   -+-          ./   ---.   /
   /     ---    /`    /|\  /
   nah   nee   nü    neh   no
                                   
   / \   |--   ---         -+-
  /   \  |       /   /\    /|\
         '--    /      \     
   ha    hee   fü    heh   ho
                                   
   ---.  ---     /    \/   -+-
    \/   ---    /     /\   -+- 
     \   ---   /--|  /      +-
   ma    me    mü    meh   mow
                                   
   -+-.        --.         --+
    |            |         --+
               --+-        --+
   yah         yü          yo
                                   
   ---   | |   | |   |     +-+
   ---.    |   | |   |     | |
     /    /    / |/  |/    +-+
   rah   ree   rü    reh   row 
   lah   lee   lü    leh   low
                                   
   .--.                    --+
      |                    --+
     /                      /
   wah                     woe
                                   
   - /
    /
   /
   n'
                                   
   -+-." -+-"  /--." /---" ---"
    | |  -+-     /      |    |  
    | /   |     /      /   ---
   gah   ghee  gü    geh   go
                                   
   -++-" - /"  --."  -+-." | /"
    ||   -/     /     |     /
     /   /     /\     '-   /
   zah   gee   zü    zeh   zoh
                                   
   /--." -+-   " /"  ---"  | "
    ./   -+-    /    -+-   |\
    /`   /     /     /     | \
   dah   dee   djü   dzeh  doe
                                   
   / \"  |--"  ---"    "   -+-"
  /   \  |       /   /\    /|\
         '--    /      \     
   bah   bee   bü    beh   boe
   vah   vee   vü    veh   voe
                                  
   / \o  |--o  ---o    o   -+-o
  /   \  |       /   /\    /|\
         '--    /      \     
   pah   pee   pü    peh   poe

When reading manga, the translators will sometimes leave in katakana in for japanese onomatopoeia. It's handy to have a printout of the katakanas to back-translate those ka-shin (blade strikes) and bo-ro-mu (explosions), instead of having to guess all the time.