Sevga is a player who wrote a letter to plane-freezer lakhranaz in Postbag 44 Postbag from the Heim. As a response a letter was received from mel-ona the scale (chaos elemental) with hints to future updates.
Hence, Sevga's name has become a runescape easter egg. If any player types Sevga into their notes, different text appears in response.
Sevga's place is runescape history is therefore based purely on luck, the player himself has not done anything particularly noteworthy, though still plays relatively frequently.
Sevga's Original account name was Dagga70 before he changed it shortly after the Update allowing it.