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Questions & Answers about Kuka on toinen?
Is toinen a regular ordinal number?
No, it is a special case! Most Finnish ordinal numbers end in -s (like kolmas for "third" and viides for "fifth"). However, the words for "first" (ensimmäinen) and "second" (toinen) are irregular and do not follow that rule.
Wait, doesn't toinen also mean "other" or "another"?
Yes, exactly. Toinen is a very common word that doubles as the ordinal number "second" and the pronoun "other" or "another". You have to rely on context to know which one is meant. In a race or a line, Kuka on toinen? clearly means "Who is second?".
Why use kuka instead of mikä here?
You use kuka ("who") because you are asking about a person. If you were looking at a list of objects or animals and wanted to know which one came second, you would ask Mikä on toinen? ("What is second?").
Why is toinen in its basic dictionary form here?
Because this sentence uses the verb on (is) to simply identify someone. When making a basic "A is B" sentence like this, the descriptive word at the end usually stays in the nominative case (the basic dictionary form).