Combine Advisor 1 Shape: they are shaped as caterpees and the only part of their body wich is not related to caterpees are their breathing masks and their arms. non of wich are "biological" wich means somebody put it on them they could have put it on themselves with their telecinesic powers but those power probably came with the equipment if they could not put all that equipment on them themselves then who did? probably the REAL leader of the combine hireacraty. he saw the Advisors usefullness and decided to give them what they needed to stand at his side
2 Real name: Shu'ulatho
Apparences: 1 on screen in Breens office while teleporting from Kleiners lab 2 on screen in front of breen when hes escaping 3 screen and in pod in citadel 4 on screen "talking" too soldiers 5 after bording trains 6 interrupting Alyx's warning signal to white forrest 7 in barn episode 2 8 two after fiering rocket into combine superportal killing eli.
4 Breen: in the end of HL2 Dr.Breen talks with an advisor on a screen saying he needs to get away. silent for moment (probably because the advisor was "talking") then Breen sais he cant survive in "that sort of enviorment" (the advisor probably sugested him to moveto the ovverworld even tho that is still unknown) tho the Advisor never said anything (probably comunicating telepaticly) after that breen sais he dosent want to be in a host body (asuming he told him to get into an advisors body) then breen accepts and runs away. this can be seen as a tape on a film in episode two, after that that an advisor apears on the screen and disapears again. followed by a pod passing through the room, causing some sort of mental attack on gordon and alyx
fun facts: altho their official title is "overlord" they are never mentioned as such