Initially, I was going to rank all champion Heats (so the champion Heat that they start their defence off with) but it would have been too much like my ranking of Heat As so instead let's actually go through all 16 mainstream Series and rank the champion runs. For this ranking we will be looking at the Champion's run and ranking them by how interesting they are, for example if a run is boring or an obvious one sided victory from beginning till end then the runs are likely to be low but a run where the champion actually had to battle tooth and nail to win from beginning till end then it will rank higher.
16th Tyranabot
It's funny, for some reason I kept thinking it was Tricerabot that won not...this. The US Series in general had poor champion runs (so expect them to litter the lower half). Tyranabot is a robot with a 4/2 win/loss ratio but it's easily one of the most forgettable champions and a robot that only has a 4/2 ratio because of blind luck for the most part...In the Nickelodeon series, the US Championship is pretty crap, only 4 robots and a total of 4 battle battles. The worse part is the champion of this series, Tyranabot. Tyranabot could barely turn in any of its fights and only really won the fights against Ninjitstu and Probaphobia through lucky circumstances with the dominant Ninjitsu randomly breaking down and Probabphbia being KOd by Matilda...yeah, pretty boring stuff but Probaphobia's attempted moving with that lifter was pretty funny.
15th Panzer MK4
I said it during my ranking of Heat A that Panzer Mk4's opening Heat was "meh" at best, with Panzer's battles being the weakest elements...and it's the same for the whole Series. Panzer MK4 isn't a bad machine but it's incredibly boring in most if not all of its fights, not every battle is bad, like the Tricerabot and the Probophobia fights but it's just a chore to sit and watch. It's a shame because Panzer is a good robot, just that its run to secure a second championship win was so boring to watch, it's not that it had an easy time either but the fights had barely anything going for them, just pushing....more pushing, maybe a flip here, but yeah...If Panzer faced better and more unique robots it would be far more interesting, but instead it just isn't. I'm almost falling asleep writing this.