Tulkas was more interested in killing Melkor than anything else, but he could only do that if Melkor was allowed to be released from his eternal prison because he finally repented of his creating crimes against the Valar.
Outside of that, he did like to have a good time. He’s about as close a match, based on the clues in the literature to whom Bombadil could be.
Except of course there’s no particular reason I can see that Bombadil would need to be a character referenced elsewhere in the canon.
What’s wrong with an enigma? Must everything be explained and spelled out for us to understand?
The biggest problem of identifying Bombadil with Tulkas is their personalities. Tulkas is more like Ares/Mars than any of the other Greek gods, whereas Bombadil is more like the Puck of Midsummer Night’s Dream than anything else I can think of offhand.
Those appear, to me at least, to be very different personality types indeed.
The wife of Tulkas was Nessa, a Queen of the Valar and the sister of Orome, who he married long before during the Spring of Ards. But Tom says he found Goldberry in the Withywindle.
Given the immense destruction and remaking of Middle Earth that occurred many times over the tens or hundreds of thousands of years involved, it seems unlikely a Withywindle, as such, existed during the Spring of Arda for Nessa/Goldberry to be found in by Tulkas/Tom.
As a Vala, it also seems unlikely she’d be called “River-Daughter,” since she was one of those who created the river in question.
Personally, I find the enigmatic and unexplained origin and nature of Tom and Goldberry quite charming.