二級士官

二 = 一 : Mnemonic symbol: a capacitor, because the two strokes remind me of the symbol in electrical drawings. Albert Einstein (Ø) is experimenting with a capacitor (二) in the space station's bathroom (Ø4). He finds that it's uncomfortable to discharge a capacitor using two flutes (一).

级 = 及 + 纟 : Joan of Arc (ji) closely investigates her newly arrived troops just inside the space station's entrance (Ø2). She ranks (级) them according to their level (级): First there is a silk worm (纟) which can at least shapeshift. On the next level, there is Yuwen Huaji (及), who has no comparable super power.

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.

官 = 㠯 + 宀 : Mnemonic symbol: to symbolize the bureaucracy involved in every governmental system I'll use a folder.

官 = 㠯 + 宀 : Gitta Giraffe just graduated from anthill, and standing in front of it, still wearing her graduation cap, she's ready to assume her post as government official. She already has a folder under each arm and is wearing big safety glasses (be safe at work!).