Why is there no official character song for Homura and Mami?


Madoka has a character song titled "See You Tomorrow" (またあした, Mata Ashita)
while Sayaka and Kyoko have a duet song titled "And I'm Home".

I just found out that Homura and Mami don't have a character song (from this
[Puella Magi wiki page](http://wiki.puella-magi.net/Madoka_Magica_Music)) like
Madoka, Sayaka, and Kyoko do. Are there any character songs for Homura and
Mami? If there aren't, why didn't they make one for them?

**Added to clarify** , by character song I mean

> A song whose vocals are credited to the character or characters singing the
> song.

as per this question [What is a “character
song”?](https://anime.stackexchange.com/q/26036/2869)




I'm not sure precisely how a character's "official" song is defined, but a
["Credens Justitiam"](https://www.youtube.com/watch?v=2MaQ6m6mho8) is, in my
experience, often associated with Mami. Here's [one
source](http://tvtropes.org/pmwiki/pmwiki.php/AwesomeMusic/PuellaMagiMadokaMagica)
that sites this as the case. Further, for a more speculative approach, this is
the song that plays during several of the scenes involving Mami, and,
likewise,

> no longer seems to play in the anime after Mami dies (if memory serves me
> correctly).

Thus it would make sense that this is identified as her theme song.

As for Homura's song, the same source I listed earlier states that Homura's
theme song is _"Puella in Somnio" ("The Girl in the Dream")_. Google searching
"homura's theme" also will return several YouTube videos all of this song. As
before, I believe this song is played most often (if not exclusively) in
scenes directly involving or featuring Homura.

