No, Ray Park isn't going to be a roaming character, but the "fake" characters will stop for photos....some will interact with you, some just kinda pause to let you snap a photo and continue their character movements.
oops again, I know Ray Park won't be roaming, I meant a "fake" darth maul, or character version of him. Glad to know they will stop for a pic!
I don't think it makes a big difference what day you do the FtF.....if starting with a bang works for your family, go for it. My family tends to do the "big" stuff nearer to the end of our visits.....anticipation and all that. When the girls were younger I always felt like if we did a big thing first they were expecting the same level of wonderful all the rest of the visit, lol. Obviously there are pros and cons for either way of doing it.....the main thing probably just being sure it happens, who cares when, lol.
I should have mentioned, we are "going all out" this trip,....my husband just doesn't know it yet
Its his birthday, so the following Friday (22) I am doing an in room celebration surprise and custom cake at Ohana for dinner.. I think if I do the FtF package the first friday, he won't see the surprises coming on his actual birthday! 

Considering that the meals were never officially announced and now are difficult to get, there is a chance that FtF will just be quietly added to the reservations so being flexible about what day you want it might make that process easier....just take the first one you can! It's almost scary how quickly things are booking up this year.....I am almost worried it is going to be even more crowded this year. Maybe fans are wanting a "fix" in anticipation of the movie coming out.
Now...if Disney would just tell us who is hosting and who will be a guest....I'm all for anticipation, but...sigh....I want to know already!