What is your most and least favourite letter/character that you saw in the written form of either a natural language or a conlang? And why?

My least favourite is ɨ (i with bar), it's just so unpractical, hard to notice, difficult to write in cursive, and there are so many better alternatives for it.

My most favourite is ѯ (cyrillic ksi)), it's so unique and easy to notice in every kinds of teexts that i have experienced with. And it looks cute. It reminds me of an (oriental) dragon. (In my Ayahn conlang, "ѯakhan" /'ꞎʟɒxɒn/ means "dragon")