Hope this is helpful! This tutorial also works great with Yugi wigs and other crazy styles like DBZ characters too! Yugi's just got different bangs, and with Dragon Ball wigs you can use the same process for the spikes, but then make the hairline out of extra wefts (See this tutorial here for hairlines: [link]
This is the wig base I used: [link]
It's pretty awesome since the wefts in the back are sewn upwards, and it's super thick.
And here's where you can get wefts: [link]
Go here for more wig styling tutorials I've done: [link]
YU-GI-OH! is (c) Kazuki Takahashi