I keep looking up character soundfonts(.sf2) but most of them suck ass and only use a single sample that plays for a limited duration. I don't use FL and would like to find good soundfonts for characters but can't find any that actually loop or sample different vowels aside from this BF soundfont.
https://gamebanana.com/tools/7036
i'm not really sure what characters you're looking for exactly, but i did find this soundfont that includes looped versions of every base game character's chromatics: https://drive.google.com/file/d/1mqHSMGqZptOW2_DWtibWfjs_4Fo2gj1M/view hopefully you can get some use out of it!