Taito is mentioned as the kanji/kokuji with the highest stroke count consisting of 84 strokes in Wikipedia.
Taito is composed of two kanji ("cloud" (雲) and "dragon" (龍) repeated three times each for a total of six characters and has the meaning of "the appearance of a dragon in flight"). It is also a ligature formed from 䨺 (tai) and 龘 (tō). It has also been pronounced daito (だいと) and otodo (おとど).
Apparently, there are two variations:
Wikipedia also adds that it may have been used in Japanese surnames but there are no citations. There is also an equivalent character in traditional Chinese.
Nihonshock.com says that it might have started as a joke and gained legitimate usage in history and explains the character as below:
That’s right, a kanji that’s not in the daikanwa. And for that matter, a kanji that’s not even in any historical Chinese records.
According to a 2002 newspaper article from Kumamoto, somebody in Japan was apparently using this as their personal name as recently as the 1960s. The kanji has been included in the most comprehensive computer-based dictionary software available (the konjyakumojikyou).
So what is the real story behind this character? Can we say that it is legit and was it ever used in the history?
Related question: Which kanji has the greatest number of strokes?