I will reply here in English so that everyone else can understand, but I'm in fact Spanish (from Vigo), where are you from?
Welcome to the community!!!
About your kakariki... maybe he's sick or just stressed about the new place/enviroment. But nevertheless it's not a good idea to introduce a new bird in the space of your other pets, quarantine is highly recommended.
Anyway, it's quite strange that a kakariki stays so static/shy, as many times after I or other colleagues have released a new bird, they just take a couple of minutes to investigate the cage, eat, and of course take a bath in the water bowl.
I have cockatiels and kakariki mixed myself, and it's very funny how they interact sometimes, I'm sure you'll have a laugh with them.
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