Shadow Heart is predictably the most popular female character and has been well written and designed. Moreover, it is universal for both good and evil heroes. But Gail was a surprise.
Hmm, we have 35% on Astarion, Minthara, Laezel and Will.

I won't tell you the exact percentages, but I'm pretty sure they are:
1. Astarion has the highest percentage (very charismatic character)
2. Next comes Minthara - 25% minus most of the female characters who helped the goblins, male characters who helped the goblins share a bed with her in 80-90% of cases.
I'm sure that her rating would have been higher if it was easier to get her / there was more motivation to help goblins. Many people did not even know that the goblins could be helped. Or they simply did not understand why they should do it. The percentages could have leveled off almost 50-50 who help tieflings and goblins if the path of evil had been better written. In this case, Minthara statistics would be much better. She could be the second most popular female character after Shadow Heart, easy.
3. Laezel - few people love her, but she definitely cannot be the last place. This is a good character, and I can see that Larian put his bet on him.
4. Will - guys won't romance him, girls are jealous of Mizora or just doesn't like him compared to others (theory). Since he loses to Gale and Astarion. I don't even take Will to the party, but kill on the spot almost at the first meeting

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Thanks to Larian for Baldurs Gate 3 and the reaction to player feedback