Parallel Pete dropped a few days ago. He doesn't seem to be getting a challenge scenario so I might as well vent my thoughts here.
First off, the new signature, Pete's Guitar, grants you unprecendented control over enemies. Exhaust it to force a non-elite enemy at your location or any connection location to move in a direction of your choice. It of course synergizes with the parallel front ability, allowing you to push enemies into Snare Traps, Makeshift Traps and whatnot. It can also indefinitely keep one non-Elite Hunter away (extremely useful in TFA and still much appreciated otherwise) and you get 1 buck or 1 horror heal each round for the trouble. You can pull a nasty monster away to give your cluever valuable time. For pesky Aloof enemies or Acolytes, you can force them to move towards your team's monster killer so that they can spend fewer actions on moving and more on killing. The possibilities are endless. This is a signature so good that it could seriously give Best Doggo a run for his money.
The downside is that Pete's weaknesses are also supercharged. Wracked by Nightmares disables both of Pete's signatures so it must be dealt with as soon as possible. The replacement weakness, Hard Times, forces you to choose and discard the same number of cards after you draw any number of cards. Occasionally this may work in your favor by getting the Improvised suite into your discard but I wouldn't rely on it. It is still a crippling weakness, perhaps a bit lower priority than Wracked by Nightmares. God helps you if you draw them back to back though.
Parallel Pete himself actually seems a bit bland when compared to his new toys though. For Parallel front, starting with Pete's Guitar is nice but the ability to recycle attached cards seems situational at best. Duke is still a great first turn asset and the ready asset ability would see a lot more play - you can also dig for Pete's Guitar then double-tap it to practically trivialize enemies until you feel like dealing with them. On the other hand, Parallel front has 7/7 health/sanity instead of 6/5 so he would be a bit bulkier if he could get Duke out early, especially with the horror heal from his Guitar. Parallel front also has 3 Fight instead of 2, but it is not enough for Pete to fight without other boosts. These differences overall do not feel significant enough to detract from the real choice - whether you want to start with the dog or the guitar.
For the back, you aren't losing a lot by going Parallel - as of TSK, there are a grand total of 8 Level 4+ Survivor cards (11 if you count the customizables), none of which seem particularly suited for Pete. The real tradeoff seems to be losing the 5 splash slots for access to Tactics 0-4 (all Improvised cards are anyway) and up to 5 Guardian level 0 cards. This feels kind of baffling - none of the off-class Tactics work particularly well with Pete's parallel front (for example, Ambush only works for enemies spawning so good luck getting it to trigger twice; "Fool me once..." has the encounter card attach to it and not the other way around so no recursion at all), and if you really like Guardian cards that much you could've taken them with your original splash slots anyway.
Overall, Parallel Pete feels like his actual investigator card is overshadowed by his replacement signatures. Quite a shame he doesn't have his own challenge scenario, but as FFG said, it is simply impossible to improve upon Duke, forever the best among all good boys. Also I think Advanced Wracked by Nightmares would give me a stroke so there's that too.