Hello summoners! My name is Andrew and ill be giving you a guide to playing Viktor, tw machine herald. This is a guide that will help you play Viktor, this guide is meant more for going mid than the other lanes.
I will be adding pictures and colorful stuff fairly soon.

You can choose between Magic pen or AP Quints, I haven't figured out which is better for him yet. I have the cheap Christmas magic pen runes but his moves scale well with ability power so maybe AP Quints are better.
AP blues, good damage.
MP Reds, once again, damage.
MR Yellows, just for some good defense as you will be most likely going mid against another AP champion.

I like to do a 9/0/21 mastery setup with Viktor because of the masteries in the Utility tree.
I take scout because this build is for laning in mid and wards are helpful.
the rest should be self explanatory.

Ill update more later, Mobafire hasnt added the Hexcore things yet so i'll let you know here.
I get the red one called death for the ignite feature on his laser and extra AP, who doesnt love extras AP? I get this after my RoA.

Alright. So, i pick the will of the ancients early because it really gives you a good advantage over your enemy, over damage AND spell vamp/lifesteal. This is amazing with your q get good health back, and a shield trololol. Also late game the aura helps other ap champs.

Grab sorcerers boots, for the magic pen and youll do fine.

RoA gives you better sustainability along with some more damage. Good item.

Now with the Hex Core, Most of the time I'll grab red. But in other cases where damage isn't needed too much. You could get the others, for example if you're dying, get yellow and you can use your Q to get you out of sticky situations. If your team needs an AoE stun with range then grab blue.

Rylais, great damage, great health. the slow is pretty nice to chase with also.

Rabadons. Just adds a ton of damage.

Evolving Technology (passive): Viktor starts with a Hex Core that provides him with stats and can be upgraded in the store to augment one of his abilities. The Hex Core can only be upgraded once, and cannot be sold back to the store

Power Transfer: (Q) Viktor blasts an enemy unit dealing magic damage, returning a portion of the damage dealt as a shield

Graviton Field: (W) Viktor conjures a heavy gravitational field that slows any target in its radius. If enemies stay too long within the radius of the device, it gets stunned.

Death Ray: (E) Viktor uses his robotic arm to fire a chaos beam that cuts across the field in a line, dealing damage to any opponents struck in its path.

Chaos Storm (Ultimate): Viktor conjures a singularity on the field which deals magic damage and briefly silences enemies. The singularity then does magic damage to all nearby enemies every second. Viktor can redirect the singularity.

Max his Q, then E, then W.

His Q is his greatest form of damage and harassment, it puts out a lot of damage, gives you a shield and has a low CD.
His E does a ton of damage(especially with the death core) so i max it second.
His W is great and all, don't get me wrong, but i don't level it up until the very end, although i do take a point in it early to help get kills or save myself from ganks.

Flash- Great escape, Great way to land a Q on a running enemy. My personal favorite for this champ.

Ignite- Goes great with your ulti, if theyre low when you use this and your ult, they wont be able to run far.

Others- Ghost, Teleport.

Early in life, Viktor discovered his passion for science and invention, particularly in the field of mechanical automation. He attended Zaun’s prestigious College of Techmaturgy and led the team that constructed Blitzcrank – a scientific breakthrough that he expected to vault him to the top of his profession. Unfortunately his triumph was usurped by Professor Stanwick, who stole credit for developing Blitzcrank’s sentience and later used Viktor’s research to revive Urgot. Viktor’s appeals for justice fell on deaf ears, and he sank into a deep depression. He withdrew from the College and barricaded himself in his private laboratory, cutting all human ties. There, in secret, he conceived a project for which nobody else could claim credit. Desiring both to revolutionize his field and to eliminate the jealous human emotions which festered inside him, he engineered parts to replace and improve his own body.

When Viktor re-emerged, almost no trace of the original man remained. Not only had he supplanted the majority of his anatomy, but his personality had changed. His previous hope to better society was replaced by an obsession with what he called “the glorious evolution.” He saw himself as the patron and pioneer of Valoran’s future – a future in which man would renounce his flesh in favor of superior hextech augmentations. Though Viktor’s initial appeals were met with heavy skepticism, scientists were confounded by the sophistication of his machinery. By integrating his mind with techmaturgical devices, he had been able to drastically accelerate the progress of his research. His transformation had stripped him of what he perceived as his emotional weaknesses, but there was some lingering residue of resentment against the Professor. Viktor joined the League of Legends to pit his inventions against the greatest opponents Valoran could offer, and to correct any weaknesses or inefficiencies that remained.

“In one’s hand, techmaturgy is a tool. As one’s hand, it is liberation.” - Viktor

This is how i play viktor, feel free to comment or Upvote! Good luck.
Send me some pictures of game history and I'll create a section to post them!
Credit for the build name goes to http://www.youtube.com/user/mcr00sterDOTA
The "lore" and "skills" section were taken from http://www.ign.com/wikis/league-of-legends/Viktor