If you are considering a marshal arts studio, you might want to understand that this type of "retail" tenant creates noise, and will disturb other adjoining tenants.. My experience has also been, unless the operator is well known in the area and have other stores, they go out of business quite often, unless well capitalized.
Cash Check businesses often do well, assuming municipalities don't enact stringent usury laws limiiting interest rates.
Barber shops have been historically strong; although, the recent downturn weeded out the average operators and a lot of "consolidation" took place. People are looking for "value" shops, where they can save some money.
A "private academy" isn't a bad use, assuming they have other locations and are successful at those locations.
The best advice I could give is to know what the market needs are in the area. Is there competition from similar users? How strong are their financials? Can they fund operations during their start-up? What is their business plan? How long have they been in business, or is this a start-up.
What does this area need? Is there a sandwich shop to feed nearby office areas. Insurance company? Water Store? Cell phone store? Nail salon? Drop off Laundry? Game store? Dentist? Pawn shop?
You can also go online to ICSC.org and purchase their marketing and tenant mix books for small centers, among others. The information is invaluable and has been developed over 50 years.
You are on the right track though in your questioning "mix." Just make sure you vet the prospects well.
Good luck.