It's arguably a bit of a historical oddity that the US has them at all. In most countries, particularly former British colonies, a pardon power of some sort exists, but in developed ones it's typically not, de facto, wielded by an individual (in the UK, for instance, it's theoretically wielded by the Home Secretary, but in practice a Home Secretary who used it unilaterally would find themselves immediately looking for a new job, and the norm is that it's barely used at all).
The UK used it a lot more at the time that the US became independent, which may be where the US got it from.
I don't think _any_ developed democratic country has a pardon power as unrestrained as the US one (even in countries with executive presidencies it's usually constrained in some way).