According to /vt/ the best chain is Fubuki/Mads Mikkelsen/Elizabeth/Chamberlain/Hitler.
Of course anyone who has ever collabed with Fubuki can be chained like this. That includes Coco (as Kson), Mori, and Kiara who have all done fan meetups at cons.
In other words, you the reader of this post could be 7 degrees from the Hitler handshake