Quiet/a little bit Shy
Almost no one talks with friends or families on buses, trains etc. Finns are indeed shy, but this rule never works on all Fins, as the Finnish people I have met so far are fine, they are not that talktive but they do talk with you.
You can never get rid of Finns if they really consider you as their friends.
Honest and super helpful
I think Finns are prety honest, cheating is never allowed for Finns, although you are their very good friend, Finns will never support you to cheat on something although your behavior will not cause any harm to anyone else. This is really admirable!
If you need help, Finns are always ready to help you, so always remember to ask for help but not freaking out when being abroad.
Finns like Sauna, lakes and forests
Finns do complain if the Sauna is not hot enough (>100 celsius degree), mixed Sauna is normal here in Finland, so never be shocked if your friends propose to have a mixed sauna. But don´t worry, you can tell them directly if you don´t like, that´s not impolite to say that. In some public place, such as swimming poor, you can not go to Sauna with wearing swimming suit, some grandma probably will tell you don´t do that in Finnish language.
The lakes and forests are really beautiful in Finland, Finns like to swim in the lake in both summer and winter, it´s amazing for me to see they jump into the lake after Sauna in winter time, I was afraid of doing that in the beginning, but now I really love to do that. It is very easy to see Finns jogging in the forests throughout the year. They really know that how to take care of the nature, I hardly see the trash in forests or lakes.
Fluent English speaking
Finns are really well educated, foreigners can always survive in Finland without speaking any Finnish language, but Finns are really happy if you try to speak a little bit of their language, that makes them don’t feel shy anymore.
Salmiakki and sisu
The very special and typical Finnish candy-Salmiakki is the favourite candy of most Finns. It is very interesting to see that and you should taste that candy if you come to Finland.
Finns like simple design, products with high quality
The finnish home brand such as Marrimekko, Iittala always fusion the elements of forests, lakes and the cartoon image of Munin into their design, which can represent the typical things that Finland has.
Seems they rarely complain and flexible with everything
Finns are very flexible and open, most of the time they are fine with a lot things. As being a foreigner, you can totally relax when hanging out with Finnish friends.
Having knowledge in sorting house trash, cares about nature, animals, there are a lot things Finnish are doing very good for the world!