When it is a direction, no. When it refers to a region, yes.
"Northeast" should be capitalized when it is used as a specific direction or a geographical region, such as "traveling northeast" or "the Northeast region of the United States." It is not capitalized when used in a general sense, such as "the winds came from the northeast."
It is capitalized at the beginning of the sentence or when it forms part of the proper noun. Examples: He headed northeast. He went to Northeast Canada.
The direction is one word, northeast, a compass heading of 045° .The airline, and the region of the US, is capitalized Northeast.
No, you would not capitalize "northeast champions" unless it is part of a title or proper noun.
Months are always capitalized, no matter where they appear in the sentence. January in northeast USA is cold. The third month is March. The woman could not decide whether to marry in May, June, September, or December. He started the job on May first, and he was fired on May second.
No, seasons are not capitalized.
"Can" is typically not capitalized in sentences unless it is the first word or part of a proper noun.
The Northeast and the Midwest
No, keywords do not have to be capitalized.
No it's not capitalized.
No it shouldn't be capitalized.
Wikipedia is capitalized.