Learn English – the phrase for ‘people always giving free advice’

I think the following terms carry the connotations you are referring to:

submissive:

• inclined or ready to submit or yield to the authority of another; unresistingly or humbly obedient.

deferential:

• that shows respectful submission or yields to the judgment, opinion, will, etc., of another.

(Dictionary.com)

To say someone is the fastest runner using "number one" you would simply use "number one" as an attributive noun phrase:

She is the number one runner in the world.

This would imply speed, since that is what running races are about, but if you absolutely had to emphasize speed you could say

She is the fastest runner in the world.

where the "number one" would be understood. It would be redundant to say "number one fastest runner" because both mean the same thing in this case. Superlatives are always "number one" and vice versa.

Maui is my number one vacation spot. [meaning favorite]

The U.S. Navy is the number one navy in the world. [meaning biggest, most powerful, etc.]

Heart disease is the number one cause of death in developing countries. [meaning leading, most fatal, etc.]

Some sticklers will insist you hyphenate the term (number-one runner, number-one navy) when using it as an attributive noun phrase, but I don't feel that is strictly necessary. There is little room for ambiguity with the term, and so a hyphen does not lend much support.