Tulkas Purpouse
 

Was Tulkas forced to aid the Valar in their fight against Melkor. Was he one of the ainur that desired to be with Eru, but was forced to go to Ea and fight against Melkor.
Or did he chose in the begining to be one of the Valar.

I believe that it was in Tulkas' nature to prove his prowess & physical strength and, therefore, he willingly joined the Valar. He knew that his powers of strength would aid them against Melkor, and I personally think he enjoyed using them to subdue Melkor. I've always pictured him more simple and human-like (LARGE human that is) than the others, rubbing his large hands in front of a yellow-bearded, grinning face. The kind of man who takes great pride in physical, back-breaking work, and relishes an afternoon nap on the green grass, a doer more than a thinker. Tulkas would not be one to stand on the sidelines while the Valar struggled against Melkor, and that is why I think he made the choice on his own to join the Valar. He adds light-heartedness and an earthiness to the ranks of the Lords of the West. As to why he came last to Arda, I do not know. Perhaps it is due to his greatness and age being less than that of those who proceeded him, his spirit was still maturing.

Purpose or porpoise? Tulkas' porpoise is an underrated character in the world of Middle Earth. He grew so large that he became embedded in the ocean floor. He is now regarded as another of the Enchanted Isles. His name is Geoffrey the Terrible.

More seriously, Tulkas seemed inherently willing to demonstrate his prowess, as has been suggested. Therefore, his assumption of the role of a Valar was natural.

I agree Tulkas willingly volunteered to come to Arda and aid the Valar:
It seems Tulkas couldn't resist; he was like a fresh calvary coming to the rescue in the nick of time, for the Valar were weary of their labors and battles with Melkor. It seems he enjoyed residing in Arda too, for he took a spouse, Nessa.

I like to think Tulkas was looking down on what was going on, and Saw how Melkor was Defacing Eru's lands and became angry, and dedicated gis live as a Valar to see to it that he protects all ME from this Evil. sure i guess you can say all the Valar felt this, but i think Tulkas was more of a go getter and had a taste for action and battle.

And let us not forget that upon coming to arda the Valar clad their radiance in corporeal body... More then to any other Vala this sort of seems to become Tulkas. Hes sort of physical type of guy.

JH

Didn't Tulkas in a way, by coming to the aid of the Valar, accepted the he would be bound to the world just as the other Valar, instead of being free and with Ilúvatar. Was that a great loss for him? Is being with the presence of Ilúvatar a better fate than the one he chose?