I nominate Babu, manservant to Tiger Ali Singh. I've just checked his Wikipedia and apparently he lasted 9 months from August 1998 - April 1999, which I find astounding given that no bugger seems to remember his existence at all. He had a total of 3 TV matches, 2 of which were on Heat/Shotgun Saturday Night. Babu seemed to debut, immediately appear into obscurity without doing anything of note and then quietly binned.
Interestingly, the guy who portrayed Babu, is Ecuadorian and that could be one claim to fame for the lad as I can't think of any other WWE guys from there.