These stand out to me each in its own way. Finger limes, Valentine pummelo hybrid, Pixie mandarin, Gold nugget mandarin, Tarocco #7 blood orange, Sumo mandarin, ponkan mandarin, Xie shan satsuma, fukumoto navel orange, Lane navel orange, Vaniglia Sanguigno acidless orange, Pineapple orange, Jincheng orange, kaffir lime, yuzu ichandrin, sudachi ichandrin.
They might interest you or not. Some of these are low acid, so not a lot of complexity to some people.