Board Thread:Off-Topic Discussion/@comment-25618373-20150816023034/@comment-66.192.13.132-20150816050855

Kamui Gakupo is the direct romanization. Camui Gackpo is just how Internet Co. wants it stylized. I think it could be comparable to how Kagamine Ren is the direct romanization but Crypton wants it to be romanized as Kagamine Len. Len and Ren both use the same characters and are pronounced the same, they're just romanized differently for stylization.

Direct Japanese romanization is typically pretty consistant. There are different systems but from my experience it seems they mostly vary in little stuff like how long vowels are spelled ("ookami" / "ohkami" / "ōkami") and ha/wa (jitsu ha / jitsu wa) and stuff.