javensbukan, welcome to the forum. Good for you doing your homework ahead of time!
I won't bother with the usual things to look for in used cars, but will focus on the i-MiEV and its features.
The car you are looking at is more desirable than the usual 2012 i-MiEV because, in late 2012, Mitsubishi introduced a "new improved" LEV50N battery with better longevity than the original.
The other feature that is desirable in this model year is that it has CHAdeMO DCFC as standard equipment. As you know from your Leaf experience, a small battery pack with DCFC greatly improves the utility of such a BEV for the occasional times you make a longer excursion, especially as CHAdeMO is widely available in your area. CHAdeMO includes automatic forced-air cooling and heating of the battery pack if needed, and a simple mod can manually duct cabin air into the battery if desired.
The price is not bad for the mileage and this model, although a bit high as might be expected from a dealer and perhaps in Canada(?). Perhaps some of our Canadian forum members might comment?
The battery State of Health is not available on the car's display (like on the Leaf); however, there are a number of apps available which, when coupled with a genuine OBDLink LX or MX Bluetooth OBDII scanner, can provide you with an insight into many of the car's parameters, especially the battery. I believe the hobdrive app will provide you with Ah capacity, as the original Android app (CaniOn), which works well for everything else ,evidently has a problem with extracting the Ah number from the 2016 i-MiEV. An alternate is a Mitsubishi-specific iCarSoft i909 instrument with its built-in OBDII cable connector.
The Achilles' heel of the Mitsubishi i-MiEV has proven to be the on-board charger (OBC) which also contains the dc-dc converter for charging the 12v battery. The OBC contains a design flaw which only starts showing up (occasionally) after about seven years and results in the inability to charge the car using the J1772 port. Very expensive, although repair of the OBC is possible. In the US, Mitsubishi has extended the warranty of the OBC to ten years, but I don't know about Canada. In any event, perhaps the 2016 i-MiEV contains an improved design (? anyone). Another problem that occurred in a few 2012 i-MiEVs in colder climates had to do with the air conditioning compressor, but I haven't heard of that issue for years. If the car has the original 12v battery, then it might be a good idea to replace it with a new one in the next couple of years, as a low 12v results in lots of strange and varying symptoms. It's a good idea to put the car on a 12v float charger if it's not being used for a few weeks.
Other than that, the i-MiEV has proven to be an incredibly reliable and totally dependable workhorse with negligible maintenance - tires being the only item as the LRR OEMs seem to last about 25K miles (40K km). It's delightful to drive, turns on a dime, has easy ingress/egress, has a huge flat floor in the back with the rear seats down, and performs well on snow.
Wish you well in pursuing this car and feel free to pelt us with specific questions. Otherwise, you might peruse some of the threads on this subforum where you posted your question for further things to look for.
EVs: 2 Wht/Blu SE Prem., '13 Tesla MS85, 3 156v CorbinSparrows (2 Li-ion), 24v EcoScoot(LiFePO4)
EV Conv: 156v '86 Ram PU, 144v '65 Saab 96
Hybrids: 48v1kW bike
ICE: '88 Isuzu Trooper. Mothballed: '67 Saab (orig.owner), '76 MBZ L206D RHD RV