正六邊形

正 = 一 + 止 : Mnemonic symbol: a stick-figure with straight lines. James II of England (zh) really has to use the engine's bathroom ((e)ng4), but there's a stick-figure (正) blocking the stalls with a barrier (止). The stick-figure measures with a flute (一) whether James is tall enough to go. James stands very straight (正) to make himself as tall as possible.

六 = 亠 + 八 : 666 is the number of the Beast, so I'll represent 六 in other character's mnemonics as the Beast. Li Qingzhao is balancing a beret on an eight ball in the outhouse's bathroom, but suddenly the Beast appears and blasts it all.

边 = 力 + 辶 : Brunhilde fell down on the sidewalk in front of the anthill. One of her gladiator sandals got stuck in a electricity line at the side of the inn.

形 = 开 + 彡 : Marie Curie (xi) is modding her fake Santa Clause beard (彡) into a new shape (形). With a bottle opener (开) she carves the beard in the engine's kitchen ((e)ng2) so that it gets a fractal (形) shape (形).