Okay. Thanks for you input.
Firstly, accordng to TV Tropes, "... {a}dding "-me" to your own name or a first-person pronoun has a self-humbling effect." For example, if the clan system were non-existant, she'd, likely show her humility by introducing herself to readers as "Koyama-me". However, the clan system's existance put more importance on status within said clan than humility, which might render the honorific (-me) inappropriate.
In terms of the profile I'm reworking, -dono would've just replaced whichever introductory honorific I used for her. However, it could've also been used on various sites as profile name. Although, considering her high status within the clan, -hime or some other upper-crust suffix seems more appropriate.
Since the profile's readers (and characters they're portraying) don't know my character personally, I was thinking something like Koyama-san for mum (Akemi; deceased) and Koyama-dono for dad (Toshio).