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Everybody talking about Riko being Ash's daughter but they ignoring an important question, Which lead girl has the best potencial to be a 10/10 MILF?
Remember becoming a good mother and a good MILF is a different thing. For example : Talia (Koharu's Mother) and Grace (Serena's mother) had more screentime and an actual rack but nether one of them got as popular as Lana's mom who does not even has a name and people mistook her to have large rack.
If the anime wants Ash to have a child with somebody than it has to be somebody who can become a 10/10 MILF like Fanart Lana's Mom. Maybe Dawn can become one if she has similar hairstyle & large rack since she has a genki personality.