--God From The Machine: The ultimate expression of his power, Ex Machina requires large amounts of machinery nearby to animate a God. By joining and drastically altering the machines, Ex Machina creates a behemoth capable of accomplishing nigh-impossible tasks and utilizing technology far, far beyond the state of the art (such as particle beam accelerators, gauss weaponry, 'Iron Curtain' field generators, nanotech swarms). Its downside is that the God From The Machine requires nothing less than Ex Machina's total concentration - he is only aware of what the God perceives and nothing else. Additionally, the God is unstable: though it can become a permanently functional unit given enough time to re-engineer it, it is very unstable shortly after its creation, such that, if Ex Machina breaks contact with it, it will collapse into a heap of junk. For this reason, any God Ex Machina animates is likely to have some sort of secure spot where he can maintain contact, though depending on time contraints, it might not be a very safe one.
Equipment:
The Toolbag: Aware of how dependent he is on machinery to get anything done, Ex Machina carries a large pack of spare parts to modify and animate, including microchips, several types of small arms and one light machinegun, several lengths of wire, LEDs, cameras, and many other necessary components. They are no substitute to preexisting Machinery, but are enough to create useful Servants or Tools as suits the situation. He also carries a cutting edge first aid kit around to mend any injuries he sustains in battle, though he acknowledges how useless it can be against individuals who are a match for him.
Auriga: A risky and potent drug, Auriga stimulates Ex Machina's brain functions, enhancing them to incredible degrees. His ability to process information is multiplied by a factor of hundreds of thousands, if not millions, allowing him to process information that would take a human several years to understand in a split second and control many more Servants than normal, and possibly even more than one God. Auriga has significant drawbacks, however: it stimulates blood circulation to the brain and puts great stress on the heart, making a fatal brain haemorrhage or heart attack a distinct, if unlikely possibility. Ex Machina carries two doses of Auriga in syringes, one small and one big. The aforementioned effects are for the small dose. Due to a natural desire to preserve his own existence, Ex Machina has not used the large dose of Auriga yet, so its effects remain unknown (though they would likely jack up his processing capabilities even further). A single small dose of Auriga lasts about an hour, and has a 'burnout' period afterward of a few hours where Ex Machina will be dizzy, weak and disoriented.
Personality:
Ex Machina is ruthlessly practical. He is not above kindness or mercy, but does not believe in tiptoeing around threats - anyone he deems a danger to others will be swiftly put down, with the minimum amount of force required to guarantee a takedown. He isn't particularly interested in fighting, but if his life in put in danger, he will employ all of his talents to subdue his aggressors. He is in love with fellow mutant and superweapon Silver Star, and has few, if any friends. He is extremely interested in the pursuit of knowledge and enlightenment, and considers it his primary priority after self-preservation and uncovering practical applications for his talents. He is also extremely arrogant and has a very high opinion of himself thanks to his superhuman intellect, though he does not boast about it in public unless taunted into doing so. He approaches most matters in a calm and collected fashion.
So yeah, that's basically it. Imagine a comic book superscientist if they weren't useless, make their ridiculous gadgets a superpower, and add a dash of hypercognition and you have Ex Machina.
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Twostuck, Homestuck RPG: http://www.gamefaqs.com/boards/8-gamefaqs-contests/62168402