Warning: hot takes below because there isn't enough information around, there are too many remaining players, and the full claims can't be 100% trusted. I'm trying at best to avoid wild theories, because with the current situation there is enough of a lack of material to go everywhere. And I just don't have the mental energy to flip my brain.
Dragon Highlanders (I was right on the reference)
Because of the There Can Only Be One shared ability, I don't think the Countdowner is among the Dragons so that's at least TricMagic, Jim Groovester, and KnightWing64 out of the way. I don't consider TolyK a true dragon because the role changing is extremely sketchy, but TolyK is more likely a 3rd party than a mafia in my eyes.
>>> Countdowner can't be a Dragon.
What-ifs for non-Dragons and non-NQT/Jack
NJW2000 as Countdowner: only possible if TolyK lied/messed up the inspect, and if NJW2000 has a 5th ability.
TolyK as Countdowner: not so impossible because they break the 4 actions limit. Overall their role and actions seemed built around curing favor with other players, which could fit with a Countdowner trying to buddy up with everyone be they Mafia or Town. Seen from this angle, TolyK as the Countdowner doesn't seem unlikely at all!
ToonyMan as Countdowner: I just realized it now, but ToonyMan can't be the Countdowner at all due to using Cool Shades last day. Unless they had a double day action, which seemed pretty unique to juicebox. I feel dumb for realizing that only now.
NQT and EuchreJack
Jack is Scum. NQT feels less helpful than past days, but their full claim feels pretty solid unless they were playing the long con. But that doesn't mean they couldn't have an ability that can be used independently from their acted persona.
Final thoughts:
Countdowner is among EuchreJack, TolyK, and maybe notquitethere. I'm giving a bit more of a pass to NQT for the effort of juggling between different personalities. Yes it is stupid, but I'm getting mentally tired too. Actually nevermind.
TolyK because there is already the Jack wagon, which I will hop on when I wake up and nothing has changed. Maybe people who passed a contract with TolyK will be able to bring some better insight. Who knows.