Star Trek often likes to reset events to avoid any chance of upsetting anyone. An example of this is Year of Hell in Voyager. If you could have killed any main character from any series who would it be and why? My choice would be for Hoshi & Mayweather to have been killed in the Xindi arc since there characters were undeveloped and not going anywhere. Would have been better to create new characters for season 4 since the show was going in a new direction.