I also like
Mirasol's idea of "how to catch a bear". That could work together with the bears, maybe as an option.
So we would have this list (and a few - silly - suggestions to get you started)
1.
(how to catch) Nalle (traps which include toothpaste may work)
2. Finnish forest
3.
(how to catch) Poppo (anything may work)
4. Finnish forest
5.
(how to catch) Lalli (people forget the bear and draw lots of pics of Emil running after Lalli this day. Nobody resists those two...)
6. Finnish forest
7.
(how to catch) Metsanukko (maybe using a mirror? it jumps off a cliff after seeing it's own reflection?)
8. Finnish forest
9.
(how to catch) Kusiaistennuolija (what a name! Putting a grenade inside some food might work fine with this one)
10. Finnish forest
11.
(how to catch) Hallavanahka (bear pit + slippery surface + someone as bait, runs and jumps over the pit... Emil, are you there?)
12. Finnish forest
13.
(how to catch) Montti (no idea)
14. Finnish forest
15.
(how to catch) Karvaturri (very fluffy, this one. Just roll it downhill)
16. Finnish forest
17.
(how to catch) Kaunoinen (we need a bigger
boat bear pit)
18. Finnish forest
19.
(how to catch) Kouvo (it looks a bit like a carpet, so maybe a vacuum cleaner?)
20. Finnish forest
21.
(how to catch) Kontio (we need something that looks like a pool of moisturizing cream. It will jump on it and drown)
And that's it, I don't think it will reach the end of the list, but Minna might be a bit tired after the chapter and finishing the bunny comic...
Of course this is just a suggestion and me trying to be funny. There are many ways to do this, and I'll be happy to follow whatever is chosen.