Eugerian or team awesome
I like their interactions and dynamics especially in season 3 but as you might guess I prefer other ships.
Also Eugene have Rapunzel (and I ship cassarian too) but as with cassunzel
They would work fine in an AU where they would be single at first and stuff.
For me they are this good friends that can be seen as a second family for each other.
They also have an age gap (which i don't really mind that much) but as i say before they could be in an AU.
So maybe an 8 for this ship i find it ok but mostly in AU :).