Lelaura is the name of a child porn star that has manifested into the form of a more proportionate, often anime-faced copy of the original [s4s]-tan and always engaging in lewd acts that are illegal in Canada. Newfigs and lewdfigs love her, but often confuse her identity with that of the similarily-named Keksandra.
Lelaura is always appealing to the fetishists that happen to browse the board, notably those who masturbate to still images of young children's feet and anime. Because of this, [s4s] has a more diverse userbase, now welcoming even the most vile pedophiles and sexual deviants to the nice board.
That being said, know the difference between a Lelaura and a Keksandra. The difference could save your life.