Argthtjtr

This next riddle will be a bit more challenging.

I am two halves of a whole,

For now only some remain.

What am I?

It could be the letter 'V'. W contains two V's. If we take the W out of Whole we get 'hole' which looks like letter O. That's what remains for the word nOw

I don't know the word in english, but are you:

Time of a day

You are two halves of a whole:

You have 12hours AM and PM to make a day

For now only some remain

You only have some hours remain to complete a day (go to next day)

Are you:

The UK's relationship with the EU aka Brexit?

I am two halves of a whole

Roughly half of the whole country voted for Brexit (52%) and roughly half against (48%).

For now only some remain

The vote was to either leave the EU or remain in the EU. The two sides then became dubbed Leavers and Remainers.

Are you your own nemesis

BATMAN?

You are Edward Nigma, the

given name of the villain The Riddler, whose name is hinted to in the title. Batman is of course a whole comprising the halves bat and man. His name includes the string "atm", which is a partial - i.e. abbreviated - way to express "now" - that is, "at the moment", for . . .

For now only some remain.

something or somebody.

1. some and thing/body are two words that when together make another whole word.

2. something and somebody refer to a whole thing/person.

3. 'For now, only "some" remain(s)'. Specifically half the word remains until the puzzle is solved and the whole word is known.

4. What am I: you are either something or somebody (like say @Edward Nigma)

Are you

Puzzle pieces

I am two halves of a whole,

two pieces will fit together to form 1 new bigger piece to the puzzle

For now only some remain.

if you put 2 puzzle pieces together you can go on with the ones left to complete the puzzle

Are you

The Northern White Rhino?

Because:

The last male died this year, leaving only two females left.