NSCL "PARDONS" and SENTENCING in CRIMINAL LAW

How judges decide what is a "fit and proper sentence" for criminal acts.

Then once a sentence is imposed, can the offender later obtain a “pardon”.

We see in the United States, that the American president has the power to “pardon” persons convicted of criminal offences as well as their friends and political allies. Indeed it appears that this power extends to granting a “presumptive pardon” before a prosecution is even initiated or while a person is being tried for an offence. Is there anything similar in Canadian criminal law?