Tato postava je zajímavá.

Tato is the feminine singular form of this in standard Czech.

The noun postava is feminine, so the demonstrative has to match it:

• masculine: ten
• feminine: ta
• neuter: to

The more explicit this forms are:

• masculine: tento
• feminine: tato
• neuter: toto

So:

• tato postava = this character / this figure

In everyday speech, people also often say tahle postava, which is more colloquial.

In Czech, every noun has a grammatical gender: masculine, feminine, or neuter.

Postava is feminine because it belongs to a common feminine noun pattern: nouns ending in -a are very often feminine.

Because postava is feminine, words that describe or point to it must agree with it:

• tato postava
• postava je zajímavá

Both tato and zajímavá are in feminine singular form.

Because adjectives in Czech must agree with the noun they describe.

Since postava is:

• feminine
• singular
• nominative

the adjective must also be:

• feminine
• singular
• nominative

So:

• masculine: zajímavý
• feminine: zajímavá
• neuter: zajímavé

Examples:

• Ten film je zajímavý. = That film is interesting.
• Tato postava je zajímavá. = This character is interesting.
• To město je zajímavé. = That town is interesting.

Postava can mean several related things depending on context, including:

• character in a story, film, game, etc.
• figure
• body shape / build

In this sentence, it most likely means character or figure, depending on the context you were given.

So Tato postava je zajímavá could mean:

• This character is interesting.
• This figure is interesting.

If you are talking about literature, film, comics, or games, character is usually the most natural translation.

Je is the 3rd person singular form of the verb být, which means to be.

So:

• je = is

The structure is very similar to English:

• Tato postava = This character
• je = is
• zajímavá = interesting

So the sentence literally works like:

• This character is interesting.

Normally, no. In standard Czech, you usually keep je in the present tense.

So:

• Tato postava je zajímavá. = correct
• Tato postava zajímavá. = not standard Czech

Czech does sometimes omit forms of to be in special styles like headlines, notes, poetry, or very informal speech, but for normal sentences you should include je.

Because the sentence is built with to be.

In Czech, with a simple sentence like X is Y, the subject is in the nominative, and the predicate adjective also agrees with it in the nominative.

So:

• postava is nominative singular
• zajímavá is also nominative singular feminine

This is different from some other structures where another case might appear, but with a basic descriptive sentence like this one, nominative is what you expect.

Yes, Czech word order is more flexible than English.

The neutral, straightforward order is:

• Tato postava je zajímavá.

But other orders are possible for emphasis:

• Zajímavá je tato postava.
• Tato zajímavá postava... if you are using the adjective directly before the noun in a different sentence structure

Changing the order changes the focus or emphasis more than the basic meaning.

For a learner, the safest neutral order is:

• Tato postava je zajímavá.

They are different words.

• zajímavá = interesting
  This is an adjective.
• zajímá = interests / is interested in
  This is a verb form from zajímat.

Compare:

• Tato postava je zajímavá. = This character is interesting.
• Tato postava mě zajímá. = This character interests me.

So even though they look related, one is an adjective and the other is a verb.

A rough English-friendly guide is:

• Tato ≈ TAH-toh
• postava ≈ POH-stah-vah
• je ≈ yeh
• zajímavá ≈ zah-YEE-mah-vah

A few useful pronunciation notes:

• Czech j sounds like English y in yes
• stress is usually on the first syllable of each word
• á is a long vowel, so it is held a bit longer than a

So the stress pattern is roughly:

• TAto
• POstava
• je
• ZAjímavá

Yes. Ta postava is also correct.

The difference is roughly:

• ta postava = that/the character depending on context
• tato postava = this character, more explicitly

In real Czech, ta is very common, and context often makes the meaning clear.
But if you want to clearly say this character, tato postava is a very good choice.

Yes, but that makes a different structure.

Your sentence:

• Tato postava je zajímavá.
• literally: This character is interesting.

If you want interesting character, you can say:

• zajímavá postava

And then in a full sentence:

• To je zajímavá postava. = That is an interesting character.

So Czech can use adjectives both:

• after to be: postava je zajímavá
• before the noun: zajímavá postava

Both are normal, but they are not exactly the same sentence pattern.

It is neutral standard Czech.

• tato sounds standard and clear
• je zajímavá is completely neutral
• the whole sentence works well in writing and speech

A more colloquial version might be:

• Tahle postava je zajímavá.

Both are correct, but:

• tato postava = more standard / careful
• tahle postava = more everyday spoken Czech