屑

屑 = 尸 + 肖 : Marie Curie (xi) and the little prince (肖) are frequently visiting a ghost (尸) in the elevator's bathroom (e4). The ghost is feeding on their dandruff (屑), therefore it's a win-win situation for all of them, but secretly they feel it beneath their dignity (不屑).

Sherlock Holmes (sh) is investigating a crime scene with a corpse (尸) in front of the space station (Ø1). The victim's ghost (尸) is trying to give him hints from the afterlife about their killer.

肖 = ⺌ + 月 : The aloe vera on the moon resembles the rose on the little prince's planet. Thus I'll represent this character by the little prince.

In the aorta's bathroom, the little prince misses his asteroid and his rose so much. To comfort him, Marie Curie gives him a moon and an aloe vera to remind him of home.