Design clarity at hallway distance. Teen wear gets seen in motion: lockers, bus stops, school cafeterias. The strongest anime t-shirts read in under two seconds, even when the wearer is walking past or partially obscured by a backpack strap. Dense character collages and tiny tagline fonts lose the read.
Identity over franchise. Designs that say 'anime' as a category, a lifestyle, an in-group label outlast designs that lean on a specific show. A 14-year-old's favorite series in spring rarely matches the favorite in fall. Slogan and chibi-archetype shirts hold up across that churn; specific-character merch ages out by the next cour.
Humor register that scales. Teens want shirts that other teens read as funny without parents finding them inappropriate. The deflection humor (creative-not-weird), the gentle self-mockery (chibi-short), and the food-overlap jokes (ramen plus anime) sit in the safe-for-school zone. Anything bordering on suggestive vocabulary stays off this list.
Cosplay-adjacent vs. casual wearability. Some designs read as convention armor, others read as Tuesday-after-school casual. The picks lean toward casual: shirts that work at school, then double at a Saturday meetup or a smaller anime club gathering, without locking the teen into convention-only wear.
Gift-buyer legibility. The adult buying the shirt needs to recognize it as 'anime' from the product page image alone. Anime gifts for teens that include the word 'anime,' 'otaku,' or 'manga' printed clearly help non-fan gift-buyers feel confident the gift will land.