Due to circumstances where my role is no longer needed and the expected growth to take on another role by my director was not met by my end, we have both come to mutual terms where I'd resign with a one month notice. However, I've actually sent a leave request of two weeks months before hand which happen to be a week after my "last day" of work. Will it be ethical to ask for that leave to be covered or remunerated instead or would that be asking too much?
Pending leave means you have not yet taken it, so you will still have that leave accrued. In many jurisdictions, accrued leave that has not been taken before resigning or being released is typically factored into your final pay - you don't generally have to ask for it.
You should check your employment agreement, if you have any such thing. You should also look up local employment regarding the remuneration of untaken leave. Finally, you can simply ask to confirm how much untaken leave you have.
Note - if you take any leave during your notice period, that will be taken from your balance.
Will it be ethical to ask for that leave to be covered or remunerated instead or would that be asking too much?
It is absolutely ethical and not too much to ask. Before you do that, however, check your employment contract, employee handbook, etc.
In the United States, at least, only a few states require payout of unused leave. Most states leave it up to the contract or company policy (and if there is no policy states vary on what has to be done) and a few states have no law or policy (in which case it would presumably be left to case law). https://www.thebalancecareers.com/do-you-get-paid-for-unused-time-if-you-re-fired-2060734