I think halberd is acualy more correct then Spear. I halberd looks like this
Witch is more of a spear with an axe blade on the end. Hence why Lust can both Spear people and slice with her nails
Glutony was created in order to make the red stones >_> i assume he excretes them or something in the movie the red stone is flying out of his body like blood. So i guess ultimate mouth or so would be a good title.
Prides eye was well if you compare it to other animes like Ban Chans Evil eye (Getbackers) or a Sharigan (sp) Naruto. Were he could omost have precogniation and even see things so detailed like how the air is moving in a room. Hes also very fast >_>
Wtf made glutony though if you see his true form in the movie that crap aint human