I'm sorry, but no. Lately I've been way to busy, and haven't worked on my hack for a while.. But I wouldn't do it even if I wasn't man, and I doubt someone else will, you gotta try to learn than ask people to do it for you
Firstly, there's two different things that I think you're confusing.
Sprites: Are normally 64x64 images of the people (like your avatar)
Overworlds: Are the little player avatar you walk around in, in game.
This is sprite editing. You need to change the default sprites to your own "Jesse and James" sprites. There are tutorials for changing intro sprites, trainer sprites and overworlds. All need changing to achieve this effect.