Aukapersónan er líka fyndin.

Aukapersónan is a compound noun.

• auka- = extra, secondary, supporting
• persóna = person, character

So aukapersóna means supporting character or side character.

The -n/-an at the end makes it definite, so aukapersónan means the supporting character.

In Icelandic, the definite article is usually attached to the noun as a suffix instead of standing alone as a separate word.

So:

• aukapersóna = a supporting character
• aukapersónan = the supporting character

This is very common in Icelandic. English learners often expect a separate word like the, but Icelandic usually builds it into the noun.

The base form is aukapersóna.

That is the indefinite singular form, the form you would normally find in a dictionary. In this sentence, it appears as aukapersónan because it is definite: the supporting character.

Er is the present singular form of að vera, which means to be.

So:

• ég er = I am
• þú ert = you are
• hann/hún/það er = he/she/it is

Since aukapersónan is a singular subject, er is the correct form.

Líka means also or too.

In this sentence, it tells you that the supporting character is funny as well, not just someone else already mentioned.

So the idea is:

• Aukapersónan er fyndin. = The supporting character is funny.
• Aukapersónan er líka fyndin. = The supporting character is also funny.

Here líka is modifying the description fyndin.

The sentence structure is very natural in Icelandic:

• Aukapersónan = subject
• er = verb
• líka fyndin = also funny

Placing líka before the adjective is a normal way to say that the subject is also that thing. Word order can shift in Icelandic depending on emphasis, but this version is straightforward and neutral.

In Icelandic, adjectives agree with the noun they describe in gender, number, and often case.

The noun aukapersóna is feminine singular, so the adjective must also be in the feminine singular form.

Forms of fyndinn:

• masculine: fyndinn
• feminine: fyndin
• neuter: fyndið

Because aukapersónan is feminine, the sentence uses fyndin.

Yes. It is a predicate adjective.

After að vera (to be), Icelandic often uses an adjective to describe the subject:

• Hann er þreyttur. = He is tired.
• Hún er skemmtileg. = She is fun.
• Aukapersónan er líka fyndin. = The supporting character is also funny.

Even though the adjective comes after the verb, it still agrees with the subject.

Yes. In Icelandic compounds, the final part usually determines the grammatical gender.

Since persóna is feminine, aukapersóna is also feminine.

That is why you get:

• aukapersónan
• fyndin

both matching a feminine singular subject.

The main thing that would change is the adjective form.

For example:

• masculine: Aukakarakterinn er líka fyndinn.
• feminine: Aukapersónan er líka fyndin.
• neuter: Barnið er líka fyndið.

The verb er stays the same in the singular, but the adjective changes to match the gender of the subject.