Previously in this series: Edna Krabappel. The world owes a great deal to minor Simpsons characters, and I have taken it upon myself to periodically-yet-irregularly celebrate them as the spirit moves me. Today we honor Milhouse Van Houten.  Milhouse Van Houten is the chump to end all chumps. His father was a chump. He comes from a long line of chumps. He was born a chump, and he'll die a chump. He…