[quote=@Lewascan2]
[@Villamvihar]
Chinami is the sort who prefers not to have nicknames most of the time, even with people she likes, but she dislikes being pigeon-holed by actually descriptive labels even more (she's a bit prickly on this particular subject, yes, since she dislikes people assuming things about her simply for her Grimoire). Since she likes Wilhelmina, "Nami" is fine. In turn, if she shortens Wilhelmina's name, it tends to be to "Mina" or "Mina-chan", since those roll off the tongue far more naturally for someone that speaks Japanese fluently. Though, she will try to call her "Helmi" mostly in front of others if the other nicknames have been conveyed to her as bothersome in some manner.
Wilhelmina would also presumably have had the context of "-chan" as a term of endearment explained to her at some point, likely after asking when Chinami slipped up and first used it.

And when Chinami offers to "carry her back", it should be relatively apparent (to someone familiar with her straightforward approach) she means a full-on princess carry roof-top-hopping spree, since said carry is technically the safest/most comfortable way an armored person could transport a not-so-armored person, especially while making super-strength leaps.
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Awesome, thanks! Mina-chan would-be completely fine with Wilhelmina~