Board Thread:Theories and Speculation/@comment-28316199-20160726212443/@comment-1872728-20160727094709

Based on the colours of all the Susanoo, their colours are taken from the rainbow:

Red: --- Orange: --- Yellow: Itachi Green: Shisui Blue: Hagoromo/Obito/Kakashi Indigo: Madara Violet: Indra/Sasuke

So based on that, Fugaku could either be Red or Orange. But since Itachi's was coloured Red, Orange, and Yellow in the anime, I'm not sure anymore. Plus, with the introduction of Hagoromo's and Indra's, it shows that they could reuse any of the colours. So ultimately, Fugaku's could be any colour, but it's most probably one of the colours in the rainbow.