If you had the Guyver, what would be your transformation word?
Sho uses Guyver.
Sean uses Guyver, well, Sean was supposed to be Sho.
Agito has been shown to use Guyver and Bio-Boost.
Lisker has been shown to use Guyver and Adapt.
Crane uses Bio-Morph.
My word of transformation would be Transform. Like, "Henshin." but in English.
Although, I feel like you don't really need a word to call the Guyver. Based on Sho not being able to call the Guyver after he killed his dad, I think the Guyver responds to emotions. That also prevent the Guyver from accidently being summoned every time you say Guyver. So in a theory, you simply need to let the Guyver know you want to summon it through your emotion and don't actually really need to say anything to summon it.