An incredibly popular Japanese voice actress
who gives her voice to many anime
characters, so popular that roles are specifically created for her and any show in which she has a role is an almost guaranteed success.
She is undoubtedly very good at what she does, but not nearly good enough to explain her vast popularity. There are others on her level of ability or above who are not nearly as popular. The explanation is probably that many characters she played became extreme fanboy magnets.