Just for fun, I throw there some observations about the (given) names of the Finnish main characters (and main support characters):
Tuuri and
Onni are Finnish words that both mean "luck", and out of them Onni can also mean "happiness" (in sense of general well-being rather than outbursts of joy). Out of them, I've seen Onni being generally used as a given name, while I have never encountered a person named Tuuri (there apparently exist some, at least according to
the name service site of Finnish population register center, but they are vanishingly rare). However, Tuuri sounds very similar to a common Finnish female name Tuuli, which also means "wind".
While being somewhat synonyms, words "tuuri" and "onni" can mean different things. "Tuuri" refers to coincidence-based luck, like winning in lottery or managing to get at bus stop just in time without looking at clock. "Onni" has boarder meanings, and it can be used in most occasions to replace "tuuri". However, "onni" also can mean general happiness and well-being, which "tuuri" never refers to. Also, "onni" is more formal and less slangish/dialectical word than "tuuri", in modern Finnish at least.
I think that the relationship of these words reflect something about the characters, too: Tuuri being more fidgetty and brash, Onni being more stable.
Lalli is also a real given name in Finnish (though not very common). Its etymology is fuzzy, but the name is best known as the name of possibly existing person in Finnish history. Namely, early Christian history. The pagan guy.
There exist several version of his story, but the main thread of most of them is this: Lalli was away from his home for some time, leaving his wife Kerttu in charge. A Swedish bishop, named Henrik/Henry, who was on his missionary travel / crusade in Finland, visits the house and eats and drinks there, and also feeds his horse. He pays for what he takes and leaves. But after Henrik leaves and when Lalli comes back, Kerttu claims that the bishop took food, drink and hay without paying them back. This enrages Lalli, and he storms after Henrik's sled, killing the bishop with his axe on the ice of Köyliönjärvi.
The stories often also mention that Lalli takes Henrik's mitre and signet ring, but once he puts them on, he can't remove them without tearing out his scalp and finger. Different stories feature also other kinds of details, usually making Lalli the bad guy and Henrik a martyr. (Which personally puzzles me, since you know, Lalli really though that Henrik didn't pay for what he took. Albeit, solving problems by raging with an axe isn't very constructive. Also, some stories imply that the mitre and the signet ring were something Lalli was originally after.)
The pagan influences of Lalli's legend pretty much fit to SSSS!Lalli's mage abilities, though personality-wise SSSS!Lalli appears really different from his legend namesake.
More about Legend!Lalli in Wikipedia.Taru is a quite typical Finnish female name that means also legend, myth or an epic story (or a lie in most negative uses). I think it fits.
