孤
=
孑
+
瓜
:
Gitta Giraffe (gu) is currently the space station's lone (孤) inhabitant. To feel less lonely (孤), she drew a mosquito's (孑) face on a melon (瓜) to have somebody to talk to in front of the space station (Ø1).
certificate / proof / to prove / to demonstrate / to confirm / variant of 症[zheng4]
证
=
正
+
讠
:
James II of England (zh) is not allowed to stay any longer in the engine, so in the bathroom ((e)ng4) he forges a visa (证) so he can stay. On an advertising column (讠) he scribbles his fake visa, but (like me) he sucks at drawing, so he is only able to draw a stick figure (正) where his photo should go.
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.