Environment be damned or don't be damned. Because you like them or because you don't like your neighbors ... what animals would you like to see locally that are not there ?
polar bears. it's the only animal that likes to eat people. daily life is just too safe and dull.
If they could cut down on the deer population, too, that would be nice.
Without taking into account the environmental impact and viability: Sicilian dwarf elephants. Come on, 1m short elephants, hairier (i.e. fluffier) than their African and Asian counterparts? I want it!
Bonus points: capybaras are native where I live, and a common occurrence in parks. Now imagine those small elephants, plus some capybaras: chilling under the grey sky, taking a bath in the lake in warmer days, gathering together in colder days... come on, it's cuteness overload!
In Minnesota... bison. Because it was their native habitat before we killed them all, and because watching jackasses in cars trying to negotiate with 1500lb bison everywhere would be hilarious.
I just moved from a place with raccoons to somewhere without them and I miss them. So raccoons. They're funny as fuck.
Beaver. Always beaver.
Australia is mostly degraded, channelised shallow creeks and erosion problems. Bam, beaver does all the work for us.
Can beavers survive in the subtropics?
I believe so. I think there was a big thing about European settlers introducing beavers to Peru or northern Chile and causing ecological havoc
Monkeys. Several species, but specifically pygmy marmosets. What I really want is Borrowers, but since the scientific community refuses to focus research on the actually important things, it feels unlikely in my lifetime. So pygmy marmosets. I want to walk onto my porch, and a troop of teeny little monkeys is chilling out there, living their best lives.
IIRC, USSR experimented with acclimating raccoons in Belarus.
Raccoons now have a stable population in Pripyat Marshes, don't know much more.
Wait they introduced the most mischievous animal in existence to the place where they're trying to contain the worst nuclear accident in history?
The USSR had 100s of nuclear reactors, yet the only meltdown was in the only nuclear plant that raccoons had access to.
There was also a very similar meltdown at Leningrad NPP in 1975, except there the situation was recognised earlier and the reactor was shut down before everything went to shit completely.
Am from tropical zone so stumble upon capybara will be nice. Though we already have tapir and that creature is rare as heck.
Easy, I'm on vacation around the New Jersey area. Release the Candiru fish. Use your fucking turn signals ass hats.