I love all of them but I think that my number one would be Korg tho since he's been in the back burner for a while now then my number one would be Logan.
1)Korg: I like him because he is extremely gentle and open to new experiences, like going to the spring, or simply learning more about human culture, and again he's such a gentle and considerate giant that I can't help but simp. Also the scene where you get his first heart? Ahhhh!!! Gimme more of that in life.
2-1)Logan: Pretty much what the other two said, how even though he clearly doesn't want you around as you get to know him and he starts caring for you, his facade starts to break little by little and the way he simply cares really deeply even when he doesn't want to admit, uhm!
3)Caleb-Bernard: I love Caleb because of how open he is about what he likes and wants as well as because I think he'd be a lot of fun to have around, Bernard I love because he is so caring and warm, and I also love how the both of them complement each other and make for the perfect throuple.
4)Scrap: He's such a sweetheart and deserves to be happy and leave the junkyard, so if marrying him is what it takes then I'm marrying him!
6)Groth: I just find him to be interesting and fun.
7)Dulrig: Because even if he acts as a pervert I think he has a lot of depth and things to find about, and that calls to me and I also simply think that he would be an actually good husband.
8)Tank: for no reason other than I want to make him happy and because I think he could be a really gentle person if given enough time and a good environment.