In the earlier Nazi Nani strips, "Mega" is writen in katakana and "Tokyo" is in kanji. Now the whole thing is in katakana.

Asmodeus speaks:
Piro asked me Sunday night which would look better. Stick with the old combination of katakana and kanji or just katakana. I suggested "Why don't we do it all in katakana?" We did that basically for visual. Nothing special.