الصديق المحظوظ هنا.

In Arabic, the verb to be is usually not written or spoken in the present tense.

So:

• الصديق المحظوظ هنا
• literally: the friend the-lucky here
• natural English: The lucky friend is here

This is called a nominal sentence in Arabic.
If you wanted the past or future, Arabic would use a verb, but in the present it is normally omitted.

Because in Arabic, adjectives usually come after the noun they describe.

So:

• الصديق = the friend
• المحظوظ = the lucky

Together:

• الصديق المحظوظ = the lucky friend

This is the normal order in Arabic:

• noun + adjective

not:

• adjective + noun

Because Arabic adjectives must match the noun they describe in definiteness.

Here:

• الصديق = the friend → definite
• المحظوظ = the lucky → also definite

So the phrase literally works like:

• the friend the-lucky

but in good English that becomes:

• the lucky friend

If the noun is definite, the adjective must also be definite.

هنا means here.

It is an adverb of place. In this sentence, it tells you where the lucky friend is:

• الصديق المحظوظ هنا
• The lucky friend is here

So the sentence has:

• الصديق المحظوظ = the subject/topic
• هنا = the predicate/complement giving location

Yes, Arabic is somewhat flexible with word order, especially with adverbs like هنا.

For example:

• الصديق المحظوظ هنا = The lucky friend is here
• هنا الصديق المحظوظ can also occur, with more emphasis on here

The version you were given is a very straightforward, natural way to say it.

In الصديق, the ل of الـ is not pronounced, because ص is a sun letter.

So:

• الصديق is pronounced roughly aṣ-ṣadīq
• not al-ṣadīq

But in المحظوظ, the ل is pronounced, because م is a moon letter:

• المحظوظ = al-maḥẓūẓ

So the full sentence is pronounced approximately:

• aṣ-ṣadīqu l-maḥẓūẓu hunā
• often said more simply without case endings in everyday careful reading: aṣ-ṣadīq al-maḥẓūẓ hunā

Because هنا is not a noun here; it is an adverb meaning here.

The definite article الـ is used with nouns and adjectives, not with words like هنا.

So:

• الصديق = definite noun
• المحظوظ = definite adjective
• هنا = adverb, so no الـ

In fully vowelled formal Arabic, you would usually write:

• الصديقُ المحظوظُ هنا

Why?

• الصديقُ ends in ـُ because it is the subject/topic of the nominal sentence
• المحظوظُ also ends in ـُ because it is an adjective matching الصديق
• هنا is an indeclinable adverb, so it does not take a changing case ending like a normal noun

In most modern printed Arabic outside fully vocalized texts, these short endings are usually not written.

Not exactly.

If you just remove الـ, you get:

• صديق محظوظ

which means a lucky friend, but Arabic often prefers a different structure when introducing an indefinite noun.

A very natural way to say A lucky friend is here or There is a lucky friend here is:

• هنا صديقٌ محظوظٌ

So your original sentence with الـ means the lucky friend is here, while the indefinite version is often phrased differently.

You would make both the noun and adjective feminine:

• الصديقة المحظوظة هنا

That means:

• الصديقة = the (female) friend
• المحظوظة = the lucky (feminine)
• هنا = here

This shows another important rule: the adjective must agree with the noun in:

• gender
• number
• definiteness
• case