Nadia seems to have fallen off the radar when it comes to 90s anime, but it's truly one of the classics of the decade. Few shows feel as equally accessible to kids and adults alike, and the show's themes about technology, power, and love remain provoking.
The characters are all so memorable. Jean and Nadia are the finest protagonists one could ask for in this sort of adventure, likable while still leaving a lot of room for character development. (Nadia can get supremely irritating at times, but she's such a unique heroine and her growth is so powerful that her more zealous moments can be tolerated.) The child Marie and Nadia's pet lion cub King are cute without being cloying, and the Grandis trio are comic gold who come to be more fleshed out as the story goes on. Nemo, Electra, and the rest of the Nautilus submarine crew are all fantastic, and the villains are sinister without feeling one-note.
The animation in the first season is breathtaking for a television series, though it notably declines in quality by the second season. Speaking of the second season, it is awful, the one true drawback to this great show. The characters lose much of the development they gained at the end of season one and little of interest happens. Unless you are a completion-ist like me, it could be skipped altogether without losing much narrative cohesiveness.
Secret of Blue Water needs rediscovery. It's much superior to some of the more popular 90s anime and as far as coming-of-age adventures go, this series dwells with the best of the genre.
