fzf-vim's :BLines¹ can enable a live search for most basic needs. For example, something like unicode.vim's :UnicodeTable, followed by :BLines, then yl to grab the char.

Note: I'm only pointing this out in the general case of wanting a live search on some data, because uni and the provided uni.vim seem to be a far better solution anyway.

¹ https://github.com/junegunn/fzf.vim