Viktor's dance is a reference to the Melbourne Shuffle, a dance originating from Australia. A side-by-side comparison can be seen here.
Viktor can be compared to Clockwerk from the Sly Cooper games. Like Clockwerk, Viktor converted his body into metal because of an obsession.
Viktor was the first champion who had a unique item available only for him (Prototype Hex Core) sharing this feature with Kalista.
Viktor is the 5th lightning themed Champion, the first being Ryze (Before his rework), the second being Blitzcrank, the third being Kennen, the fourth being Xerath and the 6th being Jayce.
His name means "winner, conqueror" in Latin (original c changes to k), sharing PIE root *weyk- "to overcome" with Veigar.
Viktor's lore resembles a lot that of a famous Serbian-American inventor, Nikola Tesla. Professor Stanwick stole credit for Viktor's creation, Blitzcrank. Similar to that was Tesla, where Thomas Edison stole credit for a lot of Tesla's work (such as the well known Edison lightbulb that Tesla made) during his time working for the famed American inventor and Guglielmo Marconi for stealing credit for the creation of the radio.
Creator Viktor is the only skin where Viktor is depicted as having his right arm replaced instead of his left one. This may indicate that Creator Viktor is in fact from a parallel universe, but for now, there isn't other evidence to support this possibility.
Viktor led the team of doctoral students that constructed Blitzcrank, the first steam automaton which obtained sentience.
Unfortunately Viktor's triumph was usurped by Professor Stanwick Pididly, who stole credit for Blitzcrank's creation. However, most now know the truth.
Viktor views Jayce, the young and charismatic inventor from Piltover, as an obstacle to his "glorious evolution". One that he must overcome.
Viktor defeated Jayce and stole a powerful arcane crystal to power his creations. Jayce later created the Mercury Hammer and counter assaulted Viktor's laboratory, destroying the arcane crystal which caused Viktor's machines to erupt in flames.
Viktor is the leader of The Evolution, seeking to replace organic life with machine-augmented bodies. The Battlecast line of skins show the results of his victory, warping the League's champions to suit his vision.
Despite Viktor's ideals clashing with most of his colleagues, he is respected by some of them, such as Heimerdinger.
Orianna is listed as Viktor's rival. This could be due to her unique construction that equals Viktor's technology in power, or because people wrongly identify her as an example of what Viktor is striving for, when in fact Viktor is striving for living technology, which Orianna is not.