Tora Tan

looking through manga volume 1, it seems generally, everyone addresses sho without an honorific. sho seems to always say tetsuro-san, sho and mizuki don't use honorifics for each other. mizuki calls tetsuro 'aniki' and I believe this stays the same throughout. tetsuro calls mizuki by name without honorific. agito uses kun on occasion for mizuki. the only time mizuki addressed agito in my brief look, she called him kaichou, president. looking at volume 31, aptom uses no honorific for sho. sho uses no honorific for aptom. seems there is not much in this book. don't really have time to look through all the others right now.

shonen ace only care about who buys shonen ace. most western manga fans are not on their radar.

I think you can find what you need here - http://web.archive.org/web/20101205045740/http://japan-legend.com/wiki/index.php?title=Guyver#Zoaforms

You have the original Guyver model kits? I am so jealous!

In a sense, Guyver is not dead, it's sleeping. Several years ago, people were upset because it was said that there were only a few more volumes to go. I think somebody said there would be no more than 35 volumes. but now, Mr Takaya has put on the breaks and he's keeping it going.