User blog comment:CNBA3/Gajeel's Iron Dragon Magic/@comment-16344653-20130730022206/@comment-4829046-20130730040723

The Green is the colour of his magic circle and magical power. Similar to Erza's Pink. It has nothing to do with the DS magic itself. And God it does not ruin it, the colours are one of the biggest reasons why I got hooked on this series when I first started it.