Fumi-LEX here, I see you've found my masterlist account!
Ideally, this account will help prevent scamming and keep track of who owns what characters in an organized manner!
To conserve time and energy, I might not respond to thank yous. You're welcome, I promise!
I've done a little digging, and found the fumi's masterlist entry here
comparing the ownership log in the TH profile and the transfer history, it seems that the owner currently listed deactivated both their deviantart and TH account (though on TH, they transferred to one last user before transferring to you) this is sufficient evidence for me to confirm that this fumi does seem to be in your ownership currently! I'm updating the ownership on the masterlist for you now, thank you for reaching out!