not enough time for a full answer, but a 9 year night is hard to survive, since sun is the source of almost all energy on a planet. I think they life would migrate so that it was always day for them by slowly traveling with the sunlight. Things that can't move (plants) would only bloom once every 9 years. Very little would try to live during the 'night'.
Since migration is simple though, it's easy to have a never-ending day. After that it's pretty easy to look at local life to see how it may adapt. There would likely be a slighter focus on efficient movement (for instance, more upright walkers like humans, who are quite efficient at long distance travel). Likewise the concept of 'territories' may change some with the need to migrate. I imagine many short lived creatures that establish a territory but will die within the 9 years so don't need to worry about migrating. All longer lived creatures will have a tendency to slowly shift their territories to keep up with a slow-pace migration.
You would have creatures evolved to the twilight, the areas where sun light is just starting to hit part of the planet, or just starting to leave as well.
Of course migration only works if you can migrate. Thus I would imagine flying and aquatic creatures as the most common. Land based critters would run into physical limitations preventing them from traveling across the entire glob.
Of course this is only part of the answer. Not all creatures will migrate, and I can think of other adaptations. I don't have time for them right now though, just wanted to toss out the most interesting/common.
To answer the question as to rather life would live during night time, yes it would. That's part of the answer I didn't have time to elaborate on.
Life always finds a way to live in the harshest of environments on earth. If there is an area without life something will adapt to live there; so long as some sort of energy source will be found. I could think up many examples of what could, but didn't want to elaborate on all of them. I think migrating species will be the most prominent creatures, by a noticeable margin, and the ones most like mammals of earth and thus most interesting to human readers, but they will not be the only types.
Look at deep see fish, that live in conditions of never-stopping night. Things could live due to heat vents and other geo-thermal energy. Some creatures will be scavengers that live by preying on things that die after night falls. Some equivlents of giant tress will simply loose it's leaves for 9 years while living off of stored energy, in fact some animals will likely evolve some extreme hibernation tactics to allow this as well (there are frogs that can live in a sort of frozen suspended animation for an eternity; and after 9 years you better believe it will be below freezing). If creatures live via the above methods in the dark then creatures will adapt to prey on the above creatures as their food source.
However, all of the above (beyond geothermal energy) effective rely on consuming energy sources generated during the 9 years of daylight, finding ways to store up energy during your 9 years of 'summer' for 9 years of 'winter' effectively. In fact maybe some version of squirrels that can store energy sources to feed them for 9 year nights by stockpiling for 9 year days could exist, though it seems less likely since that strategy only works if the squirrels can manage to keep other creatures from raiding their food supply for 9 years. A species like that would have to have a very good strategy for protecting the resources they stockpiled.
However, living during the night requires some extreme adaptations, which are different then the ones for days. I could, in fact, imagine creatures that migrate with night the same wah some migrate with day, to keep a never-changing night. Imagine a scavenger species that lives in night, and travels right at the 'edge' of night time, looking for creatures that died recently when night fell and they couldn't find food.
Creatures that live in one location for night and day seem less likely, just because of how hard it is to evolve adaptations that work in both enviroments. The most common of such species would be the 'hibernate' type, that simply go dormant during night time and start living again during day. Though, as said all adaptations will exist, some species will find a way to live through night and day cycles somehow, life is resourceful, they will just be quite uncommon.
Oh, I should mention that another option to hibernation that will be very common is 9 year life spans. A creature that lives only while it's day and dies at night, but not before planting the seeds for the next generation. Many species have adopted this strategy, most obviously in the desert where some species only live during rainy seasons and then die after leaving behind seeds/eggs for the next generation. Obviously plants will mostly always do this, but eggs capable of surviving for 9 years are possible too, though any species with this strategy would have to be HEAVILY R select species, which means they lay lots and lots of eggs expecting most to die, and aren't very intelligent.
Which, of course, means one of the most common adaptations for creatures that live during the night may be finding the eggs and seeds left for the next generation to eat. A treasure trove of stored energy left behind by the last day. Imagine a massive evolutionary arms race between better protecting your seeds/eggs so they survive for 9 years, and predators finding better ways to find these well protected eggs.
Still, migration or dying after 9 years are going to be by far the most common strategies. Hibernation (including trees that loose their leaves and similar) being the next most common strategy. Creatures living through both day and night will be quite uncommmon, though some will show up.
And now I wasted even more time on this answer; good going. There are still questions about the world itself, in particular how much energy it gets from the sun and how it regulates it, but also it's gravity, atmosphere, etc etc, which is quite relevant to creatures adaptation. For the most part I assume a 'mostly earth like' world in this answer, but I think that very interesting weather patterns would arrive from one part of the world receiving all the energy while the other doesn't; which would in turn have a strong effect on adaptions. However, I'm afraid I really don't have time to go into them.