As a Finn first things coming to my mind from Finnishness are sauna, nature, winter and four seasons. Also I would personally classify a stereotypical Finn as a shy person in the company of strangers, but with their friends and people they already familiar with they can surprise you with their true friendly and funny nature.
You may have noticed Finns facts only and straight-forwardness way of telling things without any extra added drama. Good example of this is a Finnish Formula 1 driver Kimi Räikkönen. Who is known of course for his racing skills but also for his quick honest and straight-forwardness answers, which sometimes can be considered to be also funny. Below here is Youtube Link to video of compilation of some of his press conference answers.
Facts and straight-forwardness are also part of the Finnish business culture. Other key values of the business culture are modesty, trust, individualism, respect for personal space, honesty, punctuality, education, lifelong learning and caring for nature. So example if you are watching presentation held by the Finn. You can normally expect it to be really facts oriented without any super glorification.