Amphitrite happened because I really wanted to join the game, but was unsure with which God/Goddess. I had a handful people to choose from and picked her in the end. Also, I love Megan Fox and wanted to take her as PB.
I already used Nike (as Valentina, without being Nike) in another game, but dropped and wanted to play her again. Of my characters, she's my favorite and basically a combination of two old characters- my former Val and a Nike I used to play. (I also read a crappy book about a girl being a reincarnate of Nike.)
Tia happened because I wanted to create a character fluffier than fluff, but dealing with something that is no fluff and I always wanted to make a Native-American. SO, I picked a native death-goddess and added a little fluff, voilĂ : Tia!