Ah... But Ruby did have a set personality, or schtick of her own. Perhaps you've noticed her hair in a sort of mane around her head with combed spikes shooting out from the top ring of her hair?
Not sure if that's an accurate descript of what she looked like, blind batty eyes you know.
Anyway, she wanted to have her hair that way because of her professed idol/hero... Albert Einstein.
Yeah, back in the days when Ruby Monster was on the show she was a curious monster and loved to expand her knowledge by performing experiments. Another thing to her persona, as seen when she was in the Monsterpiece Theater of Guys and Dolls, was that Ruby was a bit of a tomboy prefering to play with trucks instead of dolls.
So she was a bit of a tomboy female monster who liked to know more about the world around her. She was a nice character, even got included in the New Who's Who on SS coloring book I have in my collection.
Hope this helps and have a good day.