My only question here is: why six Overdrives?
The main use I can see for the Overdrives is for the Golden Dragons, and there's only three of them compared to the six Overdrives, which seems like a rather large difference to me (considering it's a FG, the difference would be even greater, since it'd be six Dragons against twelve Overdrives). Sure, the Archangels are still awesome for using Overdrives on, I feel that their primary uses are for healing the Overdriven dragons and serving as cannon fodder for spells like Reverse Time/Rewind, Freeze/Congeal, etc.
I suppose I could ask why there's only one Chimera as well, but it's clearly an optional card with a specific purpose. Although I can't ignore that an extra Chimera would benefit Hyperion immensely.
If I had to make any changes to the deck, it would have to be something like:
+1 Gravity Tower
+1 Chimera
-2 Light Tower
-1 Overdrive
Don't get me wrong; I'm not saying it's a bad deck (lord knows it would kick my arse any day 8) ). I just see Hyperion having some efficiency issues when he shouldn't be.
EDIT
I'll give Hyperion a try in the Trainer and see if I can't come up with any better idea or suggestions for you.
EDIT II
After playing against Hyperion with the deck I felt hit him in the weak point for massive damage ten times(5 Wins, 5 Losses), I now feel an extra Chimera or two would benefit Hyperion IMMENSELY; lets just say that, if Hyperion DID have a Chimera in his hand, my win count would almost be zero (Chimeras also happen to fit his description quite nicely as well). >_> I'll see if I fair better (or worse) against Hyperion if he has more Chimeras in his deck.