Some Pretty Cures share their seiyuu (Japanese voice actors) with Magical Girls from other series. It's kinda interesting and funny. Some examples includes parodies or are not typical Magical Girls. And some other examples are for fun.
Cure White
Seiyuu: Yukana
She is Angel Lily from Wedding Peach.
Cure Egret/Windy
Seiyuu: Enomoto Atsuko
Kurumi from Steel Angel Kurumi.
Cure Lemonade
Seiyuu: Ise Mariya
Stocking from Panty and Stocking with Garterbelt, a parody of the genre. She is actually a demon.
Levy McGarden from Fairy Tail, well, she's actually a mage, not a Magical Girl.
Cure Mint
Seiyuu: Nagano Ai
Cutey Honey from Cutey Honey Flash.
Cure Berry
Seiyuu: Kitamura Eri
Miki Sayaka from Puella Magi Madoka Magica. Being Sayaka is suffering, doesn't it, Oktavia von Seckendorff?
Well, I mentioned Levy McGarden, so I should mention Cana Arbelona from Fairy Tail. Just a mage, but not a Magical Girl.
Cure Blossom
Seiyuu: Mizuki Nana
Fate Testarossa Harlown from Magical Girl Lyrical Nanoha. Mizuki's most famost and star making role.
Fate's "older (but smaller) sister" Alicia Testarossa from Magical Girl Lyrical Nanoha INNOCENT.
And Fate's clone Levy the Slasher from Magical Girl Lyrical Nanoha A's Portable. She is the clone of that clone.
Hoshina Utau from Shugo Chara.
Prinzessin Krähe from Princess Tutu.
All of them, except Alicia, are Dark Magical Girls.
Cure Sunshine
Seiyuu: Kuwashima Houko
Jeanne from Kamikaze Kaito Jeanne.
Cure Moonlight
Seiyuu: Hisakawa Aya
Sailor Mercury from Sailor Moon. IQ 300.
Cure Beat
Seiyuu: Toyoguchi Megumi
Radical Revy-chan from the Black Lagoon Omake. That's a parody. She resolves conflicts with guns instead with magic.
Cure March
Seiyuu: Inoue Marina
Erio Mondial from Magical Girl Lyrical Nanoha StrikerS is not a Magical Girl, he is a Magical Boy. He is twelve (in StrikerS) and atleast 17 girls and women allow him to bath with them. Naked.
Cinque Nakajima from Magical Girl Lyrical Nanoha StrikerS. Despite the Japanese surname, since she lives in Mid-Childan, her is name is always in Western order.
Wendy Nakajima from Magical Girl Lyrical Nanoha StrikerS.
Senou Natsuru from Kämpfer is actually a boy who transforms into a girl. And almost every girl loves him as a girl.