When more than one character is assigned to the same location, there can be synergistic effects.
I believe that as far as Admirals on a ship or Generals on a planet/Troop Transport, their un-duplicated skills and traits will be applied at their location.
Scientists though are a bit different. Each scientist at a research station provides research bonuses to the specific research area of the station (Weapons, Energy, HighTech). Additional scientists at the same research station provide half their skills on top of the first scientist, progressively halving with each additional scientist. Thus: Scientist 1 gives full 12% energy research bonus, Scientist 2 gives half of their 10% energy research bonus (5%), Scientist 3 gives one quarter of their 8% energy research bonus (2%), for a total of 19% energy research bonus (12 + 5 + 2).
Hope this helps TJ!
Thank you; I understand now.
Remember that the evil which is now in the world will become yet more powerful, and that it is not evil which conquers evil, but only love -- Olga Romanov.