Lapis is a young woman dressed as a maid. She has slim build with a modest bust.
While at the beach she wears a blue two piece swimsuit. Though its the more tomboyish type of shorts and a tube rope.
She has a calm demeanor befitting a maid, and is usually very serious about her job. However, she can be relaxed and shows emotion. She is shown to be an extremely fast learner, but also slightly oblivious to Touya's actions. She is shown to have a childish side, as she was addicted to watching cartoons when Touya projected them.
Lapis was first introduced after Touya and the girls moved into the mansion. Lapis' placement as a maid was at the request of Tristwin Ernes Belfast since she is a member of the Espion group to watch over his daughter.
One of the maids under her as well as her former partner in the King of Belfast's secret service Espion.
Lapis was assigned to secretly guard the princess, a role Lapis ultimately becomes woefully useless for as the series professes; since Touya provides more than adequate protection (thanks in part to his divinity).
Lapis publicly acts as one of his maids, having been caught by Touya while spying on Yumina on a trip to Mismede; he keeps her spy work secret. She assigned Renne and Cesca to be his personal maids.
Due to being a spy working directly for the King, she has the ability to silently sneak up on someone as she does to Touya on occasion. Her other abilities as an Espion member are never shown or mentioned.
"So does what float at that size?" - Her question to Touya after his comment on Cecile's bust size.
"Even here I have work to do, I have been serving drinks to the ladies." - Her answer to Touya's question as to why she isn't swimming with the others.