Insider-legible joke. The humor has to land for someone who actually watches the medium, not for a generic-cartoon shopper. We keep designs that reference recognizable tropes (training arc, isekai protagonist, sub-vs-dub loyalty, chibi self-deprecation) and skip designs that lean on generic kawaii filler with no niche payload.
Typography hierarchy. A funny anime shirt lives or dies on its text. The bold lead line, any supporting copy, and small print should read at conversational distance without becoming a font-wall. Hand-drawn manga-style lettering and clean sans-serif punchlines both qualify when the layout breathes.
Trademark-clear ground. Designs need to sit in generic niche vocabulary (otaku, weeb, waifu, husbando, baka, chibi, kawaii) rather than borrowed franchise iconography. This keeps the joke ownable and avoids the awkward gap between fan-art and licensed merch.
Gift-readiness across personas. A funny anime t-shirt should work for the cosplay-light convention-goer, the casual seasonal watcher, and the dedicated otaku, ideally without a forty-minute explainer attached. The wider the recognition band, the stronger the gift case.
Print clarity over visual noise. Whether the layout is bold maximalist shonen-coded type or a quieter chibi sticker-style mascot, the silhouette should hold its shape across light and dark color stocks, with no element fighting another for attention.