This is a great song and a lot of the other chord charts are close but not 
perfect. I'm mostly just doing this so I can easily transpose the key. This is my 
first submission so hopefully I wont f it up.
Key of G

Intro: (single notes) G F# B, E D G, C B E, A D

     G        D 
When I was a young boy
    Em         G            C
My father took me into the city
    G              Am  -  D
To see a marching band
           G               D
He said, "Son, when you grow up
        Em         G               C 
Would you be the savior of the broken
      G              Am  -  D
The beaten and the damned??
           G          D
He said, "Will you defeat them
      Em           G           C
Your demons and all the non-believers
      G                   Am  -  D
The plans that they have made?
        G              D 
Because one day, I'll leave you
    Em          G               C
A phantom to lead you in the summer
    G                Am  -  D
To join the Black Parade
G D Em G C G Am D

     G        D 
When I was a young boy
    Em         G            C
My father took me into the city
    G              Am  -  D
To see a marching band
           G               D
He said, "Son, when you grow up
        Em         G               C 
Would you be the savior of the broken
      G              Am  -  D  -  G
The beaten and the damned?? 
G D Em G C  D 

*Verse 1*
     G               D
Sometimes I get the feeling
       Dm            C
She's watching over me
                     G                 D
And other times I feel like I should go
     G                      D
And through it all, the rise and fall
     Dm              C
The bodies in the streets
                         G                D
And when you're gone we want you all to know

*Chorus*
             G         D        Em
We'll carry on, we'll carry on
   G               C             
And though you're dead and gone, believe me
      D                  G        D       Em
Your memory will carry on, we'll carry on
   G       C        
And in my heart, I can't contain it
    D
The anthem won't explain it

*Verse 2*
   G                    D
A world that sends you reeling
      Dm            C
From decimated dreams
                  G                 D
Your misery and hate will kill us all
    G                     D
So paint it black and take it back
         Dm                C
Let's shout it loud and clear
                 G                D
Defiant to the end, we hear the call

*Chorus*
          G         D      Em
to carry on, we'll carry on
      G            C
And though you're dead and gone, believe me
      D                 G       D        Em
Your memory will carry on, we'll carry on
   G               C         
And though you're broken and defeated
      D               
Your weary widow marches

*Bridge*
B                                  Em
On and on we carry through the fears. (Ahh Ahh Ahh)
B                             Em 
Disappointed faces of your peers. (Ahh Ahh Ahh)
 C          
Take a look at me
                           G
'Cause I could not care at all
          D
Do or die, you'll never make me
Em                G                     C 
 Because the world, will never take my heart.
          G  
Go and try, you'll never break me
C              D                     G
 We want it all, we wanna play this part.
               D                Em
I won't explain or say I'm sorry
             G                    C
I'm unashamed, I'm gonna show my scar
             G
Give a cheer, for all the broken.
C           D                      A *(Key change to A)*
 Listen here, because it's who we are.
              E               F#m
I'm just a man, I'm not a hero
          A                      D
Just a boy who had to sing this song
          A
Just a man, I'm not a hero
E 
I   don't   care!

*Chorus*
             A       E        F#m
We'll carry on, we'll carry on
  A                D         
And though you're dead and gone, believe me
      E                  A      E        F#m
Your memory will carry on, we'll carry on
  A                D      
And though you're broken and defeated
        E                   A
You're weary widow marches on(do or die,)
E
 you'll never make me
F#m               A                     D
 Because the world, will never take my heart.

Go and try, you'll never break me
E                                    A
 We want it all, we wanna play this part
(We'll carry on)
         E    
Do or die, you'll never make me
F#m               A                     D
 Because the world, will never take my heart
                
Go and try, you'll never break me
E                                    A
 We want it all, we wanna play this part
                        (We'll carry on)

It's long I know but I hate having to stop and scroll back up cause I forgot the 
verse/chorus etc... I think this is 100%, some of the chords might be in different 
voicings but whatevs. Enjoy!