Some of my favorites off the top of my head:
That's a lot of choices already, so I am trying to figure out which ones would actually be used and which ones are kind of duplicating existing ones to narrow it down. Not sure there is something similar to JacePlz in the current set, for example, and it would be similar to the 'fffft' we see frequently. KS and ChitPie are DK-related, so they certainly make some sense, too, but that doesn't mean they would provide the humor, character, and unique applications some of the others do. Lots to consider here.