The following 2 lines in FactionDefs.xml control which research adviser you see in the game.
<NewsRobotMovie_Approach>Terran_ResearchAdviser_Approach.bk2</NewsRobotMovie_Approach>
<NewsRobotMovie_Idle>Terran_ResearchAdviser_Idle.bk2</NewsRobotMovie_Idle>
Unfortunately I don't know of a way for you to change it with the in-game race designer.