In declarative statements I’ve gathered that saying just 「これ新聞だ」for example
would be too forward or a bit aggressive. So could you just say 「これ新聞」or even
just 「新聞」for informal sentences?

I understand that い adjectives can be left on their own but I’m just not sure
how to write informal sentences with な adjectives and nouns and not using です.
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2019-05-22T20:04:26.337
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2019-05-22T21:41:21.113
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grammar adjectives nouns copula
Can だ be left off in informal sentences?
I wouldn't say using ~だ is "too aggressive", though it does have an aggressive
feel to me. Especially if you are talking in an informal setting I wouldn't be
too concerned with it. (It was formal, you would probably be using 〜です anyway)

I think you can often omit the だ for a softer feel, however in practice ~だね or
~だよ is pretty common, at least in informal conversation.
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2019-05-23T21:20:05.547
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adding だ without a particle ending as Locksleyu mentioned just seems kind of
pointless in informal cases (to my ear). You would typically only add it in
combination with a particle like ね or よ. And, instead in informal situations
(as you mentioned) you would simply omit it.

Of course this is only in spoken Japanese that typically has a "looser" feel
from a grammatical standpoint and is based more on the feeling. And, adding だ
where not needed in spoken Japanese does indeed "feel" strange and would
probably seem strange to the listener, as you mentioned.
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