各不相同

各 = 口 + 夂 : Mnemonic symbol: each and every (各) one of us is made of atoms, of which most were created in a star (from lighter atoms). That's why I choose to represent this character by a star. Guy Fawkes (g) is stepping on a mandarin (口) with high heels (夂) in the bathroom of the elevator (e4). As he squeezes, the mandarin suddenly explodes in a rain of stars (各). Each and every (各) one of them is shining brighter than the others.

不 = 丆 + 卜 : Bruno Bear (bu) is setting up a wind wheel (丆) with a voodoo staff (卜) in the space station's bathroom (Ø4). He also puts a "forbidden" sign (mnemonic symbol for 不) on it, to make clear that it may not (不) be stopped.

相 = 木 + 目 : Mnemonic symbol: I take "eye" and "tree" as resembling an ent, an alive tree. Xi Shi (xi) portrays (相) an ent (相) in the anglepod's bathroom (ang4). Unfortunately she's really bad at painting, and her portrait resembles more a Christmas tree (木). The Eye of Providence (目) enters and, just from the shape of the Christmas Tree, instantly recognizes its own portrait (相).

同 = 冂 + 𠮛 : Tommy Turtle (tu) is stapling (冂) a magical scroll (𠮛) to the wall of the engine's kitchen ((e)ng2). On it he wrote that he's looking for two twins (mnemonic symbol for 同).