I get bored of characters very easily, so most of them just never reach the point where they become significantly known. Also, I often find no sense in taking credit for characters unless I want to make a point about thanking someone or commenting openly about another character. I once took credit for an irrelevant explore shifter just to thank a few people who really helped with wand finding.
For a more recent example, not long ago I played an Imperial that I actually had some cool interactions with, including a hilarious event involving a couple oaths. I hit hero range and things went so downhill (tons of hero enemies, no ranking groups, getting multikilled) that I couldn't keep playing. Not something I wanted to dwell on.