I kind of noticed that Ryuunosuke and Ranma have a few physical similarities, and considering their origins both come Takahashi, that makes sense, but that, put on top of the fact that their lives are so similar, I can see the idea of them becoming like siblings of some sort.
I guess it's true that we never truly found out Ryunosuke's mom's identity...
... this is incredibly cursed, you know that. But ok I'll do it
a bit too wordy and self-referencial but it's my profile i'll do what i want
Gave Ranma Ryunosuke as a sibling, Akari as a cousin and Kagome and Inuyasha as great great [...] grandparents, which bloodlines will I join next
as cute as this is the less I think about Nodoka and Mr Fujinami the better I'll go wash the insides of my brain now
