The leader of D66 (Rob Jetten) has stated that he considers a coalition with PvdA-GL (Green-Labor) to be the logical option, which, considering the election results would mean a coalition of D66, PvdA-GL, VVD (cons. libs) and CDA (christian dems.).
Honestly I'd be fine with that, especially since this is the first time in over 20 years that a progressive party is the largest.
Also, this is the very first time that D66 is the largest party. I'm interested to see where that might lead.
If they'd add one of the smaller parties they might even feel lucky and add one of the smaller parties to that group, they could even get a majority in the senate.
As for the more rightwing option (D66-VVD-CDA-JA21), it's not impossible, and at first glance the JA21 leader might seem like an ok non-populistic guy, but anyone who has had any political sentience for 10 years or more knows that guy is little more than an opportunist who hops from far-right party to far-right party, until he hits paydirt. And now he did. But I'm banking on D66 being able to see through that, and pick the more balanced coalition.
The only uncertainty I'm feeling right now is that VVD might not want to work with PvdA-GL because it's 'too leftwing', which would leave a coalition with JA21 as the next option.
Choco: why are americans so weird
omniryu: To make a long story short, self esteem issue.