RagingAlcoholic
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Another one that might know that Aster is an off worlder is Eldoria, the pastry Chef. Simply because in chapter 486, during the “Whos a better sweet lover” contest, Eldoria made Aster sweets (Probably ideas from Earth) and Aster was able to correctly guess which sweet was incomplete, when Eldoria would purposely incomplete them.
Lisa would know, but never mentioned. At chapter 102 the off worlder and aster talk and after subduing the off worlder, Lisa pops up and could have over hear the conversation between aster and the off worlder. Katsuki might have an idea. Mary might have mentioned off worlders to Katsuki, to better protect her mistress. Plus the fact her follows aster everywhere Odeta, Delmare and Ardi (Odeta sister/ Aster harem member) would not know And Tiara would probably know, from one of her alternate lives that she lived after the demon kidnapping. As for Emilia, I don’t know.
Although it was not outright confirmed, in Chapter 488 Eldoria slips up and almost saying tier, which is how the “screened” boon classify ranks in magic/skills. I’m guessing Aster caught the slip up but never said anything about it.
When mommy founds out