I really don't like the song for bleach season 14 but something caught my ear, In the verse of this song, I noticed that I hear a diminished chord constantly, which seems like the characteristic of the Locrian mode. So could parts of this song be written based in the Locrian mode?

Song here: http://www.youtube.com/watch?v=ovKrRYZbyxY

no, no. It's essentially aeolian throughout. The use of the locrian is highly limited, as it does not work to our ears. It sounds too close to the ionian, needing resolution. I couldn't hear that many uses of the diminished, beyond implication and sus... I doubt the locrian was considered at all in the creation of this piece.

yeah, it is aolean, um I know locrian is known to be unusuable but I've worked with it quite alot. I came up with this chord progression in Locrian: Fm7b5 - B - D#m - C# You can write songs in it if your creative enough :D