Aoba (the tanuki): in my opinion he works more as a best friend for Volga, it doesn't catch me on the romantic side. His interactions with Volga are great and cute at times, but still I see them as more like best friends instead of as a couple. 

Tharsix (the bear): same opinion as Aoba, although not as a best friend, but a good friend regardless. His kind nature and passion for reading are appealing, but more on the platonic side rather than a romantic one (I personally would love to have a reading partner like him). 

Cyrus (the siamese cat): way too flirty for my taste. I am not saying he is terrible, but I strongly gotta agree with Volga there, he comes off way too strong in the beginning ( I myself got flustered just as Volga did 😁). Still I am curious to see how things between them develop later on.

Aquilo (the avis warrior): the first one introduced in the game gave me an interesting impression, not a strong one, but still interesting. His cryptic and mysterious nature are both appealing features for me and I am curious how things between him and Volga will evolve.

Darius (the red bull): his strong moral compass and gentle nature are extremely cute, but his timid side and complex about his feelings are both features that caught my attention. His interaction with Volga at the church summarized It all. He surely will be one of my focused goals on my first run of the game.

Kakula (the black panther): his screen time at the beginning may have been short, but more than enough to catch my interest. Hot headed game characters are just my favorite type of love interest. And his initial interest in Volga at the tournament opening ceremony made me want to know him even more. He definitely will be my primary focus on my first run 😏

Maximus (the lion): second to Kakula, this lion commander, despite the small screen time, also gave me a strong impression after he saved Volga from the monster tree, and even decided to keep what happened to Volga a secret. That alone indicates Maximus' strong sense of loyalty and moral compass, both very attractive qualities. Although Kakula is my primary focus, Maximus will be considered a secondary one.

Lambert (the fox): I am afraid there is not much I can say about Lambert since he was introduced way late in the demo. His arrogant nature and interaction with Volga were quite interesting and funny at times, but not enough to catch a more than platonic interest. (Well he was introduced all of a sudden, but still I am curious to see how things will go ).

Well that is all I can say about these potential suitors. When the game comes out I will pursue every single possibility to my heart's content. Keep up the good work developers 😉👍

Hm, well... Volga is a very different person from me, so if I try to make choices as myself, I'm afraid they're not really going to make sense for Volga. Obviously, every option that's available should theoretically be a valid option for Volga -- but I still think any choice Volga would make would be for a vastly different reason than my own.

Of course, a lot of this is because, well, I'm allosexual and arospec, and fully aware of my sexuality, very much unlike Volga. There doesn't need to be any sort of discovery process for me, and I'm not looking for one in a partner, either. Which means that the right partner for me is one who I know is interested. Currently, that seems to be just Kakula and Cyrus. But the most attractive... definitely Aoba and Tharsix.

However, as far as characters that I think would work well for Volga... I'm mostly looking at Maximus and Aquilo. They both have high integrity despite having witnessed firsthand some of the darker aspects of civilization. This is also true of Volga, so I think they would all understand each other very well. 

Murvin datable when?

I wanna give my 2 cents. As far as I know from the current state of the game, Volga will be involved with each love interest at least to some extent storywise. Thus, IMHO, he can romance any one of them, in a way that it is plausible, from the story point of view at least. I'd be curious to know which is considered canon by the devs, or whether any romance option will have an effect on the end game.

I do agree with OP that Aoba is more like a mentee to Volga, who could help Aoba be more self-confident. It is not necessarily romantic. Romancing Aoba might be pushing an otherwise wholesome mentor-mentee, strong friendship too far IMHO. I also agree that Tharsix would work better as platonic, though I can see them work. Volga could help Tharsix come out of his shell. It could be interesting and lead to believable romance.
I think that Kakula and Cyrus are similar that they are very open about their interest in Volga. I think Volga would like to slowly build it up, being this pushy might not be the best for him, methinks. I don't think Lambert is for him either, seems a bit sly and dishonest, and Volga would prefer a genuine relationship. I can totally see Volga with Aquilo, Darius and Maximus though. Especially Maximus. Both being soldiers, I can see it as a common ground the romance could build upon. All three characters seem to be honest, loyal, strong and protective and could resonate well with Volga.

But, fortunately, you can choose, or you will be able to choose any one of them.

Maybe the end game romance is the King? :D Would that be Volga's wish? :P