I don't think we'll see a Finnish character before a moment. In TN's head (and Japan), Sweden represents the Scandinavian diversity. Which is stupid because they are different countries, just like Spain and Germany.
It's like Russia, which for most people already represents Eastern Europe, so it's not likely to see a Polish fighter.
The most likely candidates (because they have a gamer community and for the sake of racial diversity) are :
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South America : A latino character would be nice in DOA! TN will probably decides between Brasil or Mexican
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Australia : Very often negleted, but they have an important market (1/20 of the US's revenues in gaming)
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Africa : Biggest video game markets are in South Africa and Nigeria, Maghreb a bit too
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Saudi Arabia : Video games is apparently growing there
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Indonesia/India : Often neglected, interesting martial arts culture
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South Korea : 4th gaming market in the world, they have an important (computer) online gaming, pro-gamers community
Mila (Spain), Marie-Rose (Sweden) and Rig (Canada) were cool additions in that sense.
Big 6 are in red.
Asia/Pacific :
1. Japan
2. China
3. Korea
4. Australia
5. Taiwan
6. Indonesia
7. India
Europe :
1. Germany
2. UK
3. France
4. Italy
5. Russia
6. Netherlands
7. Sweden
8. Switzerland
America :
1. US
2. Canada
3. Brasil
4. Mexico
5. Argentina
Others :
1. Turkey
2. Nigeria
3. Saudi Arabia
4. New Zealand
5. Egypt
6. South Africa
Source :
http://www.newzoo.com/free/rankings/top-100-countries-by-game-revenues/