Which 2 villagers are partners in crime, the peanut butter to the other's jelly, the burger to the other's fries, etc. Some examples are:
Chrissy & Francine
Julian & Colton
Beau & Diana
Lucky & Ankha
or my personal favorite, Marshal & Tutu (Tutu looks like a Marshal fangirl and its so cute!
OR it could be NPC's like
Isabelle & Digby
Reese & Cyrus
Lottie & Lyle
Hmm, I have everyone in pairs kind of in my town and my favorite has to be Baabara and Julian, she visited his house twice and I saw them talk a few times. Chrissy and Vladimir are also a pretty cute Duo.
In my town Fonebone,I have two sets of villagers that are inseparable,Marshal and Filbert and Tutu and Pinky.They always attend each other's birthday parties and always seem to be around each other when they're outdoors.
In my town it's definitely Skye and Chief. They bonded because they're wolves but they always are at each other's homes and celebrate each other's birthdays
In my town I'd always see Diana with Fang, and on her birthday he would always be the one showing up. I got a bit frustrated because I wanted her to be with Zell, but oh well.