There's a Brolli model available that replaces Vegeta. All it does is replace the looks, you don't technically get a whole new character. You have the same attacks, same PL, same transformations. You only look different. So don't go expecting miracles.
If you want the whole experience, you should get custom sprites for the character you want. www.esf-world.com has a ton of great ESF stuff, you should definitely check it out.