When Alexander first encountered the queens at the edge of Chessboard Land, the two were fighting over who would send the lump of coal to Cassima and Abdul Alhazred as a wedding gift. Blanche was mortified that the treasure she could send -- a spoiled egg -- was not nearly as valuable as the lump of coal that Ruffina was insisting would come from her. At first, Alexander provided little help. Before long, however, he returned with a large lump of coal he had found and presented it to the White Queen. Delighted, she gave the spoiled egg to Alexander.
She and Ruffina attended Alexander's wedding to Cassima, but it is unknown what wedding gifts they brought to that couple.
Blanche the White Queen is a character seen in King's Quest VI: Heir Today Gone Tomorrow.