I started bonding immediately with my rats, and now both of them literally can't get enough of me XDD At first they were pretty scared of being in a new home but they adjusted pretty well! If I disappeared for more than a few hours they will be prying their little faces through the bars of their cage and running around trying to get to me XDD
They prefer me over the rest of my 6 family members 100% if I walk near them while one of my family members is holding them and instantly want to get to me XDD (a little needy? Yes, very needy XD)
And both of them have completely different personalities, Dubs is DEFINITELY my more shy child, while Eugene is my little perky mamas boi, but they both took the instant bonding thing very well! (ofc they are both loved equally because I love my little fluff balls of kissies)
This is just my experience!

I'm not a rat genius, just a 14 y/o girl who loves her rats to the point where she'd probably sell her clothes to keep them living a healthy good life XDD