I wrote the first draft back in the late 90s/early 2000s. I think one of the major influences was an abandoned fanfiction called "Heart of Ice." That story, along with some of the ideas proposed by the likes of Lady Frieza (the biggest fangirl I recall from that time), were probably the main catalysts.
At the time, no one was publishing a backstory for the character. "Heart of Ice" focused on a fabricated twin sister and Lady Frieza's works focused on an extended family post-Namek (this was well before Kuriza was a thing).
I was young and with the likes of angelfire and geocities being relatively new, I only shared the story with close friends. I'm glad I didn't post it online because the initial draft was sappy and outright heavy-handed with how Freeza's upbringing shaped him, a tendency common in some of the popular interpretations others have gone with in the last several years.
I wanted to do something a bit more nuanced: less 'Daddy fucked with his head' and more 'This kid had a chance to be decent but he was always pretty messed up and he ends up exactly where he wanted to be.' I can easily point to the character arc of Breaking Bad's
Walter White as a direct influence to the current version of Unguarded.
Ryuu's fate is a spoiler.
It would be interesting but since Toriyama doesn't even reread his own story, I don't imagine he'd ever care to read some foreigner's deep dive about one of his villains.