Everybody uses Roman alphabet. There is nothing complex about the alphabets but perhaps alphabets like W or M require more strokes.
Today, let me introduce to you the most complex Chinese character in contemporary usage.
According to Wikipedia, the character is pronounced by biang. It is made up of 57 strokes and far too complex be entered into computers. Biang is also not found in modern dictionaries but is widely used in the province of Shaanxi, China.
So what the heck is a biang?
Quotes from Wikipedia: Biáng biáng noodles are a type of noodle popular in China's Shaanxi province. The noodles, touted as one of the "ten strange wonders of Shaanxi", are described as being like a belt, due to their thickness and length.