A little tutorial how to delete and add characters to the boat or other places:
I've forgotten to tell that you can leave most of the options as they are, you need to change only head, torso, legs, since if you don't choose all of them you will not see the character and if you choose just head - you will see only his head.
Don't forget to back up old files and save the changes if you want to keep them!
What you are changing by doing this is the CHR file associated with GR2 which holds the actual model, hence you'll have to have a GR2 of the place and its waypoints if you want to have extra characters somewhere.
Enjoy!