大勇若怯

大 = 一 + 人 : The big (大), huge (大) robot (mnemonic symbol for 大) is working out in the ashram's bathroom (a4). He's lifting a flute (一) to which Don Quixote (d) and Neanderthal man (人) are clinging.

勇 = 力 + 甬 : Yu the Great (yu) has to show her courage (勇) inside of the engine ((e)ng3). While standing next to a yongzhong bell (甬) she'll push its power button (力) for a dare.

若 = 艹 + 右 : Mnemonic symbol: a wooden chicken as in 呆若木鸡, "dumb as a wooden chicken".

A nazi wants to beat up a wooden chicken in the observatory's bathroom for being different, but just as he charges across a sheet of artificial lawn Rachel Rhinoceros pulls she sheet from under his feet and lets him topple head-first to the ground. She thinks that the nazi is truly as dumb as a wooden chicken.

怯 = 去 + 忄 : The Queen of Hearts (qi) is quite timid (怯) and does not dare to use the elevator's bathroom (e4) with her personal protection: a flail (忄) and a concrete barrel (去) which she uses as body armor.