吉

jí = ji + Ø2

lucky / giga- (meaning billion or 10^9) / surname Ji / abbr. for Jilin Province 吉林省[Ji2 lin2 Sheng3]

吉 = 口 + 士 : Mnemonic symbol: "Giga" apparently stems from a Greek word for "giant", so I'll represent 吉 by a giant.

The giant (吉) just entered the space station's kitchen (Ø2) and is very hungry. In each hand he holds Joan of Arc (ji) and the bachelor (士) captive and robs them for their mandarins (口) which he longs for.

吉 character breakdown

吉
- 口
- 士
  - 一
  - 十
    - 一
    - 丨

口

kǒu = k + ou3

mouth / classifier for things with mouths (people, domestic animals, cannons, wells etc) / classifier for bites or mouthfuls

Mnemonic symbol: 口 shall be represented by a mandarin. Karl Marx (k-) is enjoying a mandarin in the outhouse's living room (ou3).

士

shì = sh + Ø4

member of the senior ministerial class (old) / scholar (old) / bachelor / honorific / soldier / noncommissioned officer / specialist worker

士 = 十 + 一 : Sherlock Holmes (sh) is meeting the bachelor (士) in the bathroom of the space station (Ø4). Sherlock Holmes is playing a flute (一) for him, and the bachelor is wearing a huge cross (十) around his neck.