Hi Pixie
I have a Jack Russell Terrier/ Chi mix.
Kona is very loveable and friendly, she loves kids, but is a little skittish around adults, but she relaxes after I get close to her.
She has so much energy, it isn't even funny. She will run, jump, play fetch, dance, so on and so fourth, for hours on end. It seems like she never tires sometimes!!
I swear if she had the colors of a JRT, and not so much weight to her, you'd really think she was full bred. She definately has all the personality traits of one.
Be prepared if you do get this little guy. They are attention whores, so to speak, and like lots of love. They need tons of exercise, a nice, big yard, so on and so fourth. I reccomend you get him a bunch of tennis balls. From my own experiances, and from what I have heard, they LOVE to play fetch.
I hope I have helped you out!!