I'm sure you guys already have plans for a Jungle area pet, but if I could suggest one I would love to see a psychedelic mushroom friend. I chose a psychedelic mushroom because it vaguely fits the idea I have for it's power, which would be to transform the last wish perk into a perk that rerolls itself every level.
I'm not sure what the prompt would be when you interact with the mushroom, it could be something vaguely related to the theme of last wish like having to "make a wish" to the mushroom or something that makes a bit more sense, I haven't given that a lot of thought. But I think a pet like this would stand out amongst the other pets without adding another pet that deals damage, while also being thematic to the jungle.
It could also have a little bit of strategy involved regarding perk choice. If you come across a perk you really wanna keep, you could potentially ditch the pet for a different one in the level and effectively reroll last wish which would give an alternative to rerolling last wish via the golden rose. You'd sacrifice short term perk gains and a pet slot for the potential to roll into a perk of your choice.
Overall I think it'd be a fun zany pet to add that could introduce an extra element of randomness across the run that isn't too similar to Orchid's temporary perks, considering they'll last an entire level.