All of these are considered to be income, meaning that all must be reported. However, as you pointed out, some report nontaxable income. Only taxable amounts appear on Form 1040 line 4b or 5b affecting the rest of your tax return.
The code-2 Form 1099-R is required to be reflected on Form 8606 Part I (if the traditional IRA contribution resulting from the recharacterization is nondeductible) and Part II.
The code-J Form 1099-R is required to be reflected on Form 8606 Part III.
An explanation statement is required for the code-N Form 1099-R.
I assume that your retirement pension distribution is the one that is taxable and must appear on Form 1040 line 5b.
