Should this not be Rahnius (Slitheen), or perhaps Rahnius (Raxacoricofallapatorian)? I see no need for a conjectural title.
Talk about it here.
In 2009, a member of the Slitheen family posed as Ambassador Rahnius of the Galactic Alliance, using his skin as a skin suit. He teleported into Sarah Jane's attic to reward her for saving the Earth so many times. He gave her and her gang deeley boppers as gifts, but his farts soon gave him away. K9 came out and tried to stop him but he was disabled. Rahnius revealed to Sarah Jane that his plan was to capture K9, gain his knowledge and "crunch the credit of the cosmos". Sarah Jane channelled an energy reversal beam through her sonic lipstick and stuck him to the floor. He was then sent back to where he had came from by Mr Smith or "maybe a bit further". (TV: From Raxacoricofallapatorius with Love)