In school there is always more emphasis on the European Theater of WWII than on the pacific one. So I asked myself the question why is the Pacific War still relevant today because considering the fact that east Asia has outnumbered the West in population it is probably good to know if the war still effects for example relationships between asian countries. I know that WWII also started the debate about atomic warfare but what is their more?
There's a misconception that your question is based on, which is that the European Theatre is globally more emphasised. It's not.
You're likely getting greater emphasis on the European Theatre because you're living in a place that is either in Europe or has significant European heritage. Here in Asia, the fighting in the Pacific is more strongly emphasised. In each case the emphasis is on the area that is considered most relevant to the people being taught. In fact, just to illustrate this a bit, we don't really talk about WWII so much here. Instead we talk about the Second Sino-Japanese War which started 2 years earlier than WWII. That is to say, it's not first and foremost a World War. It's an Asian war that later got mixed up with what was happening in Europe around the time.
if the war still effects for example relationships between asian countries
Yes absolutely 100% it still affects relationships between Asian countries. Take for example any of the pieces of news that involve both Japan and China. Not a single interaction occurs between the two countries that does not have at least some awareness of the events of the war. The same can be said for the relationship between Korea and Japan and to a lesser extent Taiwan and Japan. It's absolutely present in people's minds here and strongly influences how countries in the region interact.