I don't think Honor fits for the Almighty, as it only focuses on one of the ten Orders of Knights Radiant, most specifically Kaladin's Order. Yeah, it was a major theme of the book, but it was Kaladin's book, so it makes sense that his trait would be the defining one thematically. I don't think we can safely say that the whole series and the Almighty are similarly defined by that. Especially as learning, honesty, justice, and the traits of all the other Orders are opposite of Odium's nature as well. I think the Almighty would have to be something that encompasses or embodies all the traits of the ten Orders, like Philium, which is essentially Love and creation, and the exact opposite of Odium and desolation. The individual traits of the orders could be splinters of the almighty's shard, one specific aspect of philium or charity or whatever his shard is, maybe carved off by the Almighty himself and granted to humanity, much like I imagine Endowment does on Nalthis (as Returned are supposed to be Splinters and I don't think there's any reason to believe Endowment is dead).
However, I'm convinced Odium does have a polar opposite to counterweight his shard's nature, like Ruin and Preservation balanced each other...its the only way Adonalsium could have been a balanced entity instead of leaning more towards having a darker nature or a lighter nature. That said, I'm not entirely convinced the Almighty has to be that opposite shard. He's referred to as He Who Transforms, and I think Transformation certainly seems a good fit for him, or Change, or whatever...just because he and Odium are both on Roshar doesn't mean the dynamic between them is the same as the shards on Scadrial. Cultivation is there too after all. Come to think of it, its said that humanity was cast out of the Tranquiline Halls by Odium and the Voidbringers....but nowhere does it say (to my memory) that the Almighty came with them from the Tranquiline Halls. There could be another world out there, the Tranquiline Halls, and that's where Odium's opposite shard is, and Odium corrupted or somehow resulted in humanity being exiled from that perfect world, and coming to Roshar...where Transormation and Cultivation could have already been. I think the Shin are Cultivation's people, and the fact that they and their land is so different from the rest of Roshar makes me think they were the original natives of Roshar, and were there before the conflict between Odium and the Almighty or whoever else brought other humans and Voidbringers to Roshar.