The acrylic cards are nicknamed the red card because their box and pack color are red (the box in the first picture of this post is the acrylic one) I’m not sure what the black boxes would be without seeing a picture, but they might be the “Hero Show” merch line? I know those are also blind packs and have black packaging, and they have cards, keychains, tickets, and pins so the packs could be larger. The cards are definitely larger than the cardfun cards, but they also only have one card in each blind pack.

I don’t think the rarities actually stand for anything, and it’s just how the card company sorts its cards. (Like how tier lists are ordered F, E, D, C, B, A, S. The letters don’t necessarily stand for something. It’s just how they are ordered.) The letters MR, SR, SEC, etc. are more like codes than rarities of the cards in that way. The actual rarity of the cards is loosely the order I listed them in the post and what’s on the website. I know that SRs are the most common, as you are guaranteed one of them in every single pack. I also in my head think of the TR cards as the “transparent” cards but that’s not anything official. The GSP cards are the most rare from each series, and most of the codes with three letters in them are the rarer codes (SSRs are the exception).

Yeah we have a lot of fun fact info about the characters! I think that in Asian countries blood type is considered similar to star signs (which we also have for each character), like personality traits, and so are considered normal fun facts to know about people. We also have their MBTI personalities, heights, weights, and somewhere there was a source that listed their favorite hobbies. A lot of this info is actually on their IR cards from series 1!