He's far less powerful than you might assume, especially as far as Servant on Servant combat is concerned. For example, even a rather weak Saber would have no problem virtually curbstomping a character with such obscenely low physical stats.
That said, it isn't really a reason to deny the character, so without further ado, on to my personal review~ (May be subject to change at any time, and it is in no way final, just my opinion.)
Territory Change is, surprisingly, totally legit. It has been shown that under special circumstances, Class Skills can be exchanged, and with his special magical skillset, I believe it's okay for you to have that rather powerful skill.
Magical Singing should be renamed to something cooler, although this isn't really criticism.
Noble Phantasms Must have an active effect and rank (unless I'm mistaken.)
All in all, while my "review" may seem positive, Your character will definitely require a bit of tweaking in the future. Expect us.