I'm going to try to stat out the original titans from Greek mythology. (I'm doing them in 3.5 because U_K might make 4e versions and because I'm more familiar with it.)
I'm thinking the "First Generation" titans (Cronus, Coeus, etc) will be upper end Colossal to Titanic, and will be in the Greater Deity-Old One HD range (100-200 HD), getting Sidereal HD (d100s) and Elder One level divine bonuses (+24). The "Second Generation" titans (Prometheus, Atlas, etc.) will be Gargantuan to Colossal, and will be in the Demi-deity - Intermediate Deity HD range (30-70 HD), getting Immortal HD (d20s) and Lesser Deity level divine bonuses (+8). All have Maven + Omnicompetent.
Prometheus
The Firebringer
Size/Type: Gargantuan Outsider (Chaotic, Extraplanar, Fire)
Hit Dice: 30d20+420 (1020 hp)
Initiative: +22
Speed: 80 ft.
Armor Class: 37 (-4 size, +6 Dex, +15 natural, +2 insight, +8 divine), touch 12, flat-footed 29
Base Attack/Grapple: +30/+60
Attack: Godcleaver +57 melee (4d6+32 and 3d6 fire/19-20/x3) or searing bolt +40 ranged touch (15d6)
Full Attack: Godcleaver +57/+52/+47/+42 melee (4d6+32 and 3d6 fire/19-20/x3) or searing bolt +40 ranged touch (15d6)
Space/Reach: 20 ft./15 ft.
Special Attacks: Searing bolt, spell-like abilities
Special Qualities: Change shape, damage reduction 15/lawful (3/-), divine bonus, darkvision 60 ft., maven/omnicompetent, perfection of foresight, spell resistance 38
Saves: Fort +39, Ref +33, Will +38
Abilities: Str 47, Dex 22, Con 39, Int 35, Wis 37 (32 without Jewel), Cha 33 (28 without Jewel)
Skills: All skills +41 + ability modifier
Feats: Awesome Blow, Blind-Fight, Cleave, Improved Bull Rush, Improved Initiative, Improved Sunder, Power Attack, Quicken Spell-Like Ability (fire storm)
Epic Feats: Blinding Speed, Damage Reduction, Superior Initiative
Alignment: Chaotic good
Prometheus, while lesser than most of the other titans, is one of the cleverest of them and a benefactor of mankind. He brought fire to humanity and was punished for it by Zeus; when Zeus relented, Prometheus was freed by Heracles and the two were reconciled.
Prometheus appears as a gigantic man about 36 feet tall, usually clad in Greek style. He is rarely armed, but when he must fight, he does so with an enormous axe.
Searing Bolt (Su): Prometheus can hurl bolts of divine flame against foes. Range 1600 ft., requires a ranged touch attack to hit, deals 15d6 damage; half is fire damage, half is divine damage.
Spell-like Abilities: At will—chain lightning (DC 35), charm monster (DC 33), cure critical wounds (DC 33), daylight, fireball (DC 32), fire storm (DC 36), greater dispel magic, hold monster (DC 34), holy smite (DC 33), invisibility, invisibility purge, levitate, persistent image (DC 34), remove curse (DC 33), scorching ray; 3/day—delayed blast fireball (DC 36), etherealness, word of chaos (DC 36), summon nature’s ally IX; 1/day—gate, greater restoration, maze, meteor swarm (DC 38). Caster level 30th (32nd with fire spells so long as he wears The Stolen Flame). The save DCs are Charisma-based.
Divine Bonus: As the equivalent of a lesser deity, Prometheus benefits from a +8 divine bonus.
Perfection of Foresight: Prometheus benefits from a permanent foresight effect (cannot be flat-footed or surprised, +2 insight bonus to AC and Reflex saves) and can use the benefits of moment of prescience (+25 insight bonus to single attack roll, ability or skill check, saving throw, or AC against a single attack) once per day, both at 30th caster level.
Artifacts:
Godslicer: +5 adamantine keen battleaxe of Gargantuan size, can cut through any substance (enhancement bonus is treated as +10 when used to sunder). This is the same axe used by Prometheus to split Zeus' skull to allow Athena to escape.
The Stolen Flame: A flame preserved in an indestructible strand bound around his brows, which nevertheless resembles an ordinary plant stem, this item gives the Firebringer great powers over flame. While he wears it any weapon he wields or melee attack he makes has the fiery blast weapon special ability (+3d6 fire damage, multiplied on critical hits), and any spell-like abilities or spells with the fire descriptor are used at +2 caster levels.
Jewel of Primeval Knowledge: An artifact older than the gods, this jewel gives Prometheus a +5 bonus to all his mental ability scores so long as it is worn.
