A necessary inquiry involving one of my stories.

As a lot of you have known of my story The Witches of Moonlight Lake, things have finally started to take shape. However with this next update, I feel will truly cement the whole concept I'm going for in order to advance the plot. The entire first act is nearly done and with that said, I require some input. You see, the three main characters essentially are witches. With that in mind, it comes to my extensive research that in some common modern-day practices of Witchcraft, a witch will sometimes have a familiar to aid them. As is such, what kinds of familiars do you think Solaria, Terra Nova and Artemis could be associated with?