Pictures
A good shot of his back on (v4, p72).
The following were notes while the character was evolving. They do not necessarily represent the way it came out.
From the Cast List:
Revels in frequent roles as "Klaus, the Heterodyne Boys' Cowardly Sidekick." Is convinced that there is no problem that cannot be solved by some form of pie.He is a cooking Spark, but not very good at it (v4, p89-90). He espouses the "Unified Pie Theory" (v4, p99).
While he plays Klaus as a comic character, he nonetheless tries to play him with some real dignity, believing (correctly) that that's essential to the character (v5, p41).