After your claim that Sonic is the most oversexualized property, I decided to uncover what the most oversexualized property actually is using facts and logic. For my data, I checked the amount of posts tagged as a specific property on e621. e621 is restricted to furries only. This isn’t a problem, as any property without furries probably won’t make the top 10. The only problem with this method is that tag counts include sfw and nsfw posts. This is only a minor problem, as most content on e621 is nsfw.

Results:

The most sexualized property is MLP, with the close second being Pokémon. Pokémon is a bit over 4000 posts behind MLP, which may seem like a lot, until you consider that both have over 200,000 posts. The third highest property is MLP friendship is magic with over 170,000 posts. Friendship is Magic is the fourth series of MLP, which is the one most associated with bronies. In fourth place, with over 40,000 posts is Sonic the Hedgehog. This has about a fifth as many posts as MLP.

5th is, quite predictably, Zootopia, with about 35,000 posts.

6th is Digimon with about 28,000

7th is Undertale with about 25,000

8th is Mario Bros with about 18,000

9th is Animal Crossing with about 18,000

10th is Star Fox with about 16,000

11th is Warcraft with about 15,000

12th is FNAF with about 13,000