Short version: I'm designing a dragon with a humanoid body. He's pretty much a Darth Vader clone as far as mannerisms, presence, motivations and complete lack of nonsense. The stats I have are below:

Susthilvistrix, Great Wyrm Purple Dragonkin
Large Dragon
HD 28d12 + 112 (316 HP)
Initiative: +5
Speed: 40 ft, burrow 20 ft
AC: 41 (-1 size, +5 Dex, +27 Natural Armor)
Base Attack/Grapple: +28/+45
Attack:
Full Attack:
Space/Reach: 10 ft/10 ft
Special Attacks: Tail Grapple, Breath Weapons, Spell-Like Abilities, Spells
Special Qualities: DR 20/Magic, SR 33, low-light vision, dark vision 60 ft, immunity to magic sleep effects and paralysis
Saves: Fort +22, Ref +21, Will +23
Abilities: STR 36, DEX 20, CON 22, INT 36, WIS 25, CHA 46
Skills: Listen +22, Search +22, Spot +22, Concentration +21, Diplomacy +33, Escape Artist +20, Intimidate +33, Knowledge (Arcana) +28, Knowledge (Geography) +28, Knowledge (Local) +28, Knowledge (History) +28, Sense Motive +22, Use Magic Device +33, Tumble +12, Spellcraft +25, Speak Language
Feats: Two-Weapon Fighting (bonus), Deadly Defense, Improved Two-Weapon Fighting, Greater Two-Weapon Fighting, Two-Weapon Defense, Combat Expertise, Double Hit, Combat Reflexes, Improved Combat Reflexes, Improved Two-Weapon Defense, Defensive Opportunist
Environment: Any
Organization: Solitary
Challenge Rating: 26
Treasure:
Alignment: Neutral Evil
Advancement: By Character Class

Languages Known: Common, Draconic, Aragrakh (ancient draconic), Jogishk (ogre dialect), Jotunhaug (hill/mountain giant dialect), Ghukliak (goblinoid), Dethek (Alphabet on which Dwarven, Ghukliak, and Gnomish are based), Tuigan, Undercommon, Yipyak (kobold, based on the draconic alphabet), Rasallesian, Ffolk-Illuskan, Battle Signals, and Code.