After much thought today I have decided that 2 of the characters from the original pilot "The Cage" will also be in the mod and one character prior to the pilot is very much active during the timeline of the mod.
The timeline of these characters are as follows and going back in time:
Kirk replaced Captain Christopher Pike and assumed command of the Enterprise in 2265 and we meet the rest of the crew in Spock, MCCoy, Uhuru, Scotty and Sulu.
Captain Christopher Pike is promoted to Fleet Captain and sometime in the next 2 years prior to 2267 he is injured with radiation burns and ends up in the wheelchair and is last seen in 2267 in the Menagerie Episode.Christopher Pike became captain of the Enterprise in 2251 after the first captain of the Enterprise (Captain Robert April) stepped down. Pike was captain of the Enterprise for 13 years and because of this he has an active role in this mod as he is around from 2251 through to 2267.
The first character I am adding to the mod apart from Christopher Pike is Doctor Phillip Boyce who was the doctor on board the Enterprise from 2246 to 2264. Some 18 years spent serving the first 2 captains of the Enterprise and my reason why Doctor Phillip Boyce is in the mod.
In 2242 Robert April was in charge of the construction of the Enterprise and in 2245 he assumed command as first captain of the Enterprise. He stepped down in 2251 and was promoted first to Commodore , then became an Admiral and then eventually an Ambassador.
Due to his importance to the Enterprise Captain Robert April is also a part of the mod. However as he was only seen in an animated episode of Trek I have had to makeup his character for this mod.
Below I have added my interpretation of Robert April based on his age as seen in the animated episode. I have also added Doctor Boyce to the picture below.
So the characters in this mod from before Kirks era are"
- Captain Robert April
- Doctor Phillip Boyce
- Captain Christopher Pike
Roy

Captain Robert April and Doctor Boyce