Learn English – What does “his mirror” refer to in this context

Answer for Question 1:

The phrase "as necessary" refers to "the pact". This can be seen by noting the comma-delimited, parenthetic phrase. Here is the original:

Ma and his ruling Kuomintang Party have promoted the pact , which faces a final review in parliament on April 8, as necessary to maintain Taiwan's competitiveness and status as an export powerhouse.

The comma-delimited phrase can be removed and the sentence will still be grammatically correct. This shows that the phrase "as necessary" refers to "the pact" (and not to the review).

Answer for Question 2:

The following are some options to make the sentence easier to understand:

• Use dashes instead of commas: "Ma and his ruling Kuomintang Party have promoted the pact - which faces a final review in parliament on April 8 - as necessary to maintain Taiwan's competitiveness and status as an export powerhouse."

• Use the passive voice: "The pact, which faces a final review in parliament on April 8, has been promoted by Ma and his ruling Kuomintang Party as necessary to maintain Taiwan's competitiveness and status as an export powerhouse."

• Use two or more sentences: "The pact has been promoted by Ma and his ruling Kuomintang Party. They say it is necessary in order to maintain Taiwan's competitiveness and to maintain Taiwan's status as an export powerhouse. The pact faces a final review in parliament on April 8."

Reference Info: Parenthetic Phrases

Parenthetic phrases are non-restrictive relative clauses.

• As a relative clause (aka adjectival or adjective clause), it acts as an adjective which describes the noun before it ("the pact"). Note the relative pronoun at the start of the clause (ie. "which") links the preceding noun to the rest of the clause.
• As a "non-restrictive" relative clause (aka non-defining or non-identifying relative clause, aka "parenthetic phrase"), it is separated from the sentence with commas, dashes, or parentheses. It can be removed and the sentence will remain grammatically correct.

For example, consider the following:

• "The dog, which was brown, was playful." can be rewritten as "The dog was playful. (And incidentally, it was brown.)" The parenthetic information is not essential to the sentence.

• "The dog that was brown was playful." can be rewritten as "The brown dog was playful." In this case, the phrase "that was brown" is considered an essential part of the subject and if it were removed, the meaning of the sentence would be changed.

See LEO Netword / Learn English Grammar: Clauses for more information on types of clauses.

The "standard" spelling is

Scary-looking thing, isn't he?

I'm not entirely sure, but I believe this kind of spelling is called "eye dialect":

Eye dialect is the use of nonstandard spelling for speech to draw attention to pronunciation. The term was coined by George Philip Krapp to refer to the literary technique of using nonstandard spelling that implies a pronunciation of the given word that is actually standard, such as wimmin for women; the spelling indicates that the character's speech overall is dialectal, foreign, or uneducated. This form of nonstandard spelling differs from others in that a difference in spelling does not indicate a difference in pronunciation of a word. That is, it is dialect to the eye rather than to the ear. It suggests that a character "would use a vulgar pronunciation if there were one" and "is at the level of ignorance where one misspells in this fashion, hence mispronounces as well".

The term is less commonly also used to refer to pronunciation spellings, that is, spellings of words that indicate that they are pronounced in a nonstandard way. For example, an author might write dat as an attempt at accurate transcription of a nonstandard pronunciation of that. The rest of this article will discuss the former definition.

(Wikipedia)

There's likely a technical point here I'm unaware of. Anyway, at the very least, the point of this spelling is to show that he speaks very differently from the others. I imagine it possibly reflects a real-world dialect, but I wouldn't know which one.