De mis gatos, el más cariñoso siempre se queda conmigo en el sofá.

De mis gatos means of my cats / among my cats and sets the topic before the main statement.

It is like saying:

As for my cats, the most affectionate one always stays with me on the sofa.

This fronted phrase helps narrow the group first, and then the sentence identifies one member of that group.

You could also say:

El más cariñoso de mis gatos siempre se queda conmigo en el sofá.

That version is also very natural.

The comma marks De mis gatos as a topic-setting phrase, separate from the main clause.

So the structure is:

De mis gatos, → topic/frame
el más cariñoso siempre se queda conmigo en el sofá → main statement

In English, this is similar to writing:

Of my cats, the most affectionate one always stays with me on the sofa.

The comma helps the reader hear that pause.

Spanish normally uses the definite article with this kind of superlative:

el más cariñoso = the most affectionate

So:

• cariñoso = affectionate
• más cariñoso = more affectionate
• el más cariñoso = the most affectionate

Without el, it would usually mean more affectionate, not the most affectionate.

The sentence leaves out the noun gato because it is already understood from De mis gatos.

So:

el más cariñoso really means the most affectionate one or the most affectionate cat.

Spanish often omits a noun when the adjective phrase clearly refers back to something already mentioned.

Compare:

• el más cariñoso = the most affectionate one
• la más cariñosa = the most affectionate one (feminine)

Because the implied noun is gato, which is masculine singular.

Even though mis gatos is plural, the sentence is talking about just one cat:

el más cariñoso = the most affectionate male cat / the most affectionate one

If you were talking about cats known to be female, you might say:

De mis gatas, la más cariñosa siempre se queda conmigo en el sofá.

Because quedarse and quedar are different.

Here, quedarse means to stay / remain:

• Se queda conmigo = He/She stays with me

By contrast, quedar often means things like:

• to remain left over
• to arrange to meet
• to suit / fit

So in this sentence, se queda is the correct verb for a cat that stays with someone.

It means to stay with me or to remain by my side.

So the idea is that, out of all the speaker’s cats, the most affectionate one is the one that stays with the speaker on the sofa.

It suggests closeness and companionship, not just physical location.

After con, Spanish uses special forms with yo and tú:

• conmigo = with me
• contigo = with you

So you say:

• se queda conmigo
• not se queda con mí

This is just a fixed grammar rule in Spanish.

Siempre often goes before the verb or verb phrase to mean always.

So:

el más cariñoso siempre se queda conmigo...

is a very natural word order.

You could also hear variations like:

• El más cariñoso se queda siempre conmigo...

But the original version sounds smoother and more neutral in most contexts.

In Spanish, en is commonly used for location with furniture such as beds, chairs, and sofas, where English often uses on.

So:

• en el sofá = on the sofa
• en la cama = on the bed
• en la silla = on the chair

Sobre el sofá usually sounds more literal, like on top of the sofa, and is less natural here.

Not in this sentence.

Although de often means of or from, here De mis gatos means of my cats / among my cats, not physical movement from them.

So the idea is selection within a group:

Of my cats, the most affectionate...

not

From my cats...

Context tells you which meaning de has.

Yes, Entre mis gatos can work, and it means among my cats.

For example:

Entre mis gatos, el más cariñoso siempre se queda conmigo en el sofá.

That said, De mis gatos is very natural when you are identifying one member of a group. It has the feel of of my cats, the one that...

Because mis gatos names the whole group first, and then the sentence picks out one cat from that group.

The logic is:

1. Here is the group: my cats
2. From that group, which one?
3. The most affectionate one

So the plural is necessary because the comparison is within the whole set.

Yes. It is a superlative comparison.

The sentence compares all of the speaker’s cats and says that one of them has the highest degree of affection.

Structure:

el más + adjective

So:

el más cariñoso = the most affectionate

This is different from a simple comparative:

más cariñoso que otro = more affectionate than another one

The full subject phrase is already present as el más cariñoso, so nothing important is omitted there.

But Spanish often allows omission when the context is very clear. For example, after already identifying the cat, someone might later say simply:

Siempre se queda conmigo en el sofá.

That would still be understood as He/She always stays with me on the sofa.

In the original sentence, though, keeping el más cariñoso is important because it tells us which cat is being talked about.

Grammatically, it is masculine singular, so it agrees with gato.

However, in Spanish, a masculine form can sometimes refer to an animal whose sex is unknown or not being emphasized, especially if the speaker uses gato as the basic label.

If the speaker specifically wanted to refer to a female cat, they would normally say:

la más cariñosa

especially if the group were mis gatas.

Yes, it sounds natural in Spain Spanish.

Nothing in the sentence is especially regional or unusual:

• De mis gatos is natural
• el más cariñoso is standard
• se queda conmigo is standard
• en el sofá is very natural in Spain

It sounds like normal everyday Spanish.