吉
=
口
+
士
:
Mnemonic symbol: "Giga" stems from a Greek word for "giant", so I'll represent 吉 by a giant.
吉
=
口
+
士
:
The giant just arrived at the space station and is very hungry. In each hand he holds Joan of Arc and the bachelor captive and robs them for their mandarins which he longs for.
(possessive particle, literary equivalent of 的[de5]) / him / her / it
之
=
丶
+
Z
:
Mnemonic symbol: Sooo sleepy... "zZz" (the character looks like a "Z"). James II of England (zh) fell asleep in front of the space station (Ø1). He sleeps on a big petal leaf (丶), making loud "zZz" (之) sounds.
岛
=
乌
+
山
:
Don Quixote (d) is trapped on a remote island (岛) inside of the aortas (ao3). The only animal on the island is a black crow (乌), and Don Quixote is chasing it with a fork (山) round and round the island, trying to catch it.