And actually, I might be able to BS my way through it, like Chris. I'll channel him:
"Sonic calls Amy "Rose-chan" in one episode of the Sonic anime and because I feel Rosechu and Sonichu connect way better than those two, I used Sonikku's term of affection for Amy as the basis of Sonichu's heartsweet, and somehow, it matched up exactly!"
"Um... well Shadow was... um... originally "Dark Sonic" but they said "blackku" meaning, he was just "The Black", like the darkness, so just like Sonikku, that was my basis. Stupid dubs not including that!"
(It's all BS)
Ah ha, yes, that's akin to what Chris would say, using the same 'logic' he applied to "Sonikku".