Comments from the second tankoubon:

Title:	Guru / Madoushi (Master Sorceror)
Age:	745 Cephiran years
Favorite thing:	Silence
Least favorite thing:	Rowdiness
Hobbies:	going on walks, talking to seijyus (spirit beasts / pets)

<Alice> Who has volume 2?
<Yang> It's up in my computer.... don't know how
       to use it, because I let Julian take care of
       all the computer work.
<Satsuki> Here, let me look at your computer then.
<Yang> How?  It's all the way in Heinesen.
<Satsuki> BEAST can go everywhere. *grin*
* BEAST beeps.
* Satsuki starts reading the incoming information.
<Satsuki> "The Master Sorceror that provides magic
          and teaches the spells to people who possess
          magical potential.  He promised Princess
          Emeraude to help lead those summoned from
          another world to become the Magic Knights.
          He looks like a child, but is 745 years old.
          He is the supreme Yil (magician) --
          therefore the title "Guru".  He seems to
          have a short temper."
<Asuka> As Umi said, he's pushing the limits of
        plastic surgeons!
<ChunHyang> Silly!  He lives in a world where plastic
            surgeons mean nothing!  He WANTS to
            look that young!
<Asuka> It's probably because he saw how ugly he
        would look if he tried to look any older than
        10 years old!
<ChunHyang> Or because Emeraude also looked young --
            so he felt he had to match her in looking
            young.
<Alice> The character design for Clef in the
        "RayEarth" OVA is one of a nice
        twentysomething person, though.
<Rei> Yes, he seems to grow up. 
<Asuka> *grinning* I like the OVA Clef.  *dreamy
        look* He's ALMOST as cool as Kaji-san.  But
        in the original anime and manga, he's so....
<Shinji> Bitchy?
<Rei> He does come across as slightly harsh in the
      first few episodes.  But he has shown a kinder,
      gentler side later on....
<Alice> Another good proof that love can change
        personalities, maybe?  ^_^
<Asuka> .....but can we do something about his
        height?
<Shinji> There she goes again about heights....