Okay, I've read this in Arena 37c (1993, February):
According to hide and Pata, Heath is always folding his clothes into very neat columns (as if on a shop display) and keeping his room clean. (hide actually goes as far as calling it a disease).
He's also difficult to go shopping with, as he slowly and systematically goes through the department store, apparently anxious to check out everything and compare prices before he buys anything (unlike hide, who calls his own shopping quick-paced).