I’m going to do this off the top of my head, rather than consulting the actual fonts first, so I may be inserting foot in mouth, but . . .

I dislike the “zero” characters in Sabon and Stempel Garamond that are (respectively) a perfect circle, unstressed, and a character with equal weight on both sides and vertivcal rather than oblique stress. Both of these seem sharply arresting to my eye rather than flowing, because their personalities look (to my eye at least) so different from all their sibling glyphs. Do others find this charming in these two cases? Or are you also bothered by this? The Sabon 0 actually looks like a wrong font to me when combined with the other o.s. figs.

Bruce

I hate the ampersand in Rotis Sans. I also hate MS Trebuchet but especially the lowercase g.

I despise the italic h where the leg curls back towards the stem. It comes from setting maths, and using 4 point sub-subscripts. Editors continually marking my work asking me to change the character to an h when it already was one. (at that size, especially on photocopies, it looks like a b.)

Bruce, surely if those zero characters you dislike harmonized more with the rest of the alphabet, there would be a greater opportunity for confusing them with the letter “o”? Which typefaces have, in your opinion, zeroes that both harmonize and disambiguate?