Glad you got the idea. Though I understand that you might not find a Charlie Brown Cafe interesting, the idea itself is similar to a cosplay cafe in the US because really, no one knows who Charlie Brown is in Asia but that's the only continent where you can find them.
To put it simply, a themed-cafe is a themed-cafe, no one gives a shit about the atmosphere unless you're French. So, one of the things YOU would wanna do is to GET RID of things that might scare away people from entering it in the first place. COSPLAY, usually scares people away at the first mention of the name BUT if done right, as in, not too weeaboo-y and cater to a larger audience, it might do WONDERS.
The problem is, no one -not even Japan- has ever done it right so, it's better to go with the traditional rules of business and common sense as opposed to 'appealing to a niche market' for this in my opinion. Focus more on food and service as opposed to the theme itself. However, market it -not- as if it were a generic cafe in an anime world but instead PICK A SPECIFIC ANIME!
Because if it's ambiguous as opposed to 'Hey, check out this EVA-themed cafe!' you would only further scare away any potential customer. See, The cosplay cafe I mentioned in the previous post is located in Singapore, right in front of a figure shop and a video game store which is a REALLY strategic place to set up shop. BUT, for all the times I'd gone past the cafe, I always feel like it's wrong. I'm not sure why but my analysis are:
-It's a generic meido cafe filled with girls with crazy-colored hair.
-For some reason, there's a Rei figure and some K-On figures on display in a glass case at the entrance
-It doesn't have too much barrier so anyone could easily see who's inside.
-Food is unclear because there's nothing to indicate what kinds of food they sell there.
Likewise, I also feel that this cafe is wrong too. Even without the hair colors
BUT then again, it's JAPAN so at least a generic meido cafe works because the whole place (Akihabara) is basically THE ANIME WORLD.
But let's go back to Charlie Brown cafe. Singapore and Hong Kong is nothing like America BUT I do feel like the cafe is done right. Again, I'm not sure why but my analysis are:
-It's a generic Starbucks cafe filled with normal college-aged people serving coffee
-For some reason, there are actual Peanuts comics at the CORNER of the cafe
-It literally has no walls on the seating area. Though the cafe itself has a feeling of a small cafe in AMERICA with its cramped space and all.
-Food is clear from the get go because they put them on display.
So, why not have a cafe with say, a Drrr!! Theme but instead of Anri and Mikado wannabees waiting the tables, have normal people wait them instead. Then, you can put a TV at the corner playing Drrr!! and no one would care anyway because really, who goes to Popeye's to watch Popeye? Lastly, make sure to advertise the food clearly and give people AS LITTLE privacy as possible so that you'd give out the idea of 'Hey, I'm in a Drrr!! cafe and I'm cool' air to the joint.
Phew, that's a lot of text! Then again, you're in English class so...