Slovenia is very ethnically homogeneous. While in general, I don't consider ethnic tensions as the most important cause of the wars, they were important during the immediate run up to and the course of the war. As Slovenia had no significant Serbian minority, their defense could not be used as a explanation and legitimation of the war.

In the years immediately before war, Milošević still primarily concerned with recentralization of Yugoslavia, while at the same time disintegration or reorganization as a confederacy was discussed, conditioned the disintegration with border changes, using the argument that Serbs would be marginalized at best or expelled and killed at worst otherwise.

Considering that, there was no real willingness among either Serbian, Yugoslav or army leadership for war in Slovenia, not was there any sort of legitimation for it beyond keeping it in Yugoslavia. However, according to some interpretations of 1974 constitution, republics had the right to separation (other interpretation was that they had sovereign rights up to, and excluding, separation). Still, it was equally difficult to just simply let Slovenia go without any sort of intervention, because it would encourage other republics, primarily Croatia, to separate.

Rather low willingness for fight in Slovenia was accompanied with decisive and stiff Slovenian resistance, even if most of the fighting was low level. Slovenians neither made claims and threats they could not enforce, not showed any reluctance to make good on them. If I recall correctly, an example would be the ban on helicopter overflights followed by shooting down those that violated it. Similarly determined resistance was shown in all aspects. That quickly destroyed already extremely week morale among troops, form the start unwilling to fight against one of the Yugoslav nations. It became obvious very quickly to army and Yugoslav leadership that as far as troops were concerned they had to choose between abandoning Slovenia or widespread desertions, likely mutinies and possible collapse of army as a whole.

In subsequent wars Slovenia didn't play any direct role, but it did offer verbal, what we might call moral, support to Croatia and Bosniaks in their own wars for independence. Maybe more significant than that, it cooperated with them on the diplomatic field.

Slovenia and Croatia declared independence at the same time and were the first to break from the federation. Slovenia's only ex-Yugoslavian neighbor is Croatia. The reason for the "ten day war" was that the elements in the government in Yugoslavia wanted to prevent Slovenia from gaining independence. Even the YPA at that time was divided about what to do. Especially because it consisted of soldiers from Croatia, Bosnia and Macedonia who were all pretty much preparing to declare their own independence and didn't want to fight for any cause that would keep the federation alive. Slovenia was attacked mostly by YPA units located in Croatia, but with Croatia declaring independence they would have to wage war with both countries at the same time which was pretty much impossible. With the separation of the states the YPA was effectively falling apart and reforming and the national armies of the separated states were coming out of the YPA. Also it was war on Italy's and Austria's doorstep so there was diplomatic pressure from the EC to end the conflict soon.

Slovenia didn't play any significant role in the subsequent wars. The remainder of what was the YPA in Slovenia withdrew. The Slovenian armed forces didn't engage in any conflicts further. There were territorial disputes between Croatia and Slovenia which didn't escalate.