Here are the designs for the main protagonists of Galacticats, as you may have already seen in the poster I made a while ago. This shows their whole bodies, as well as the character of their father.

Galaxy: The leader-type character, and captain of their spaceship. Her personality is balanced.

Vega: The comedic relief character, has a few "blonde moments". Also shows more emotion than the other two.

Polaris: The less emotional, more serious. Puts emphasis on fighting over any other resolution. Apathetic at times.

Father: I wrote "Father" because his real name will never be revealed. I thought it would be an interesting mystery to have. He is obviously the space cat sisters' father, and offers guidance when needed through a hologram or communication screen, because he is off hidden somewhere that nobody knows where. Typically most of his body will not be shown, except for an episode I'm thinking of where he could get captured and they have to save him. This will be the only time we see him in person.

The overall design of the space cats are slightly modeled after the Sphynx cat (only not hairless), and the father (and all males) has a face structure similar to the Oriental Shorthair.