I have received unconditional love before, but not romantic love, just friendship love. (The word has so many different meanings it gets really hard to describe. And I don't know the cartoon series so I can't tell if any of this is what you meant.)
In one case the person almost never says anything directly about it, it's just there in her actions. The other person we do talk about our friendship a lot. The problem is, in both cases the other person initiated and pursued the friendship while I did nothing for a long time until I figured out how to respond. One friendship was started offline because a person thought since I was weird I might be interesting, and the other friendship started online when the person thought I resembled what she was like when younger and wanted to help me with some problems I had at the time. Both people feel like family members now.
Both happened at times when I was not looking for it. And both happened with the other person initiating all the contact. So unfortunately I haven't the foggiest idea how to help, and was reluctant to post this because it seemed kind of useless, just like "Yeah I have this but I don't know how to end up in this situation on purpose."
_________________
"In my world it's a place of patterns and feel. In my world it's a haven for what is real. It's my world, nobody can steal it, but people like me, we live in the shadows." -Donna Williams