Urusei0Yatsura:
I guess one of the largest factors that appeal to most men (and some women) is that she wears a bikini most of the time. That certainly does it for me. Women should wear bikinis all the time Spoiler (hover to show)
err maybe not What I also like about her is she has long hair and its green, although my favourite hair colour is blue. Her breasts are a bit small though.
cata:
Lum has small breasts? LMAO! For a thin person, they're big. Also, Anime differs from reality. Sometimes it sucks, sometimes it's great. If you think Lum's breast size is small, you have watched too many Tsunade-kind of character.
spotless:
not only tsunade, in the new ecchi anime almost every girls has big breasts. comparing to them, yes, Lum has small breasts, but she looks perfect with her proportions.