Sano's pretty easy going, though sometimes he can get too involved if something angers him. He tends to like most people though.
Adel: Adel's skills impress Sanosuke, but that's about it. He thinks Adel's too easy to give up, to just think of himself as weak and do nothing, even for a little while. Chances are this is because of his sore spot with Kenshin giving up in canon. He isn't on good terms with the guy, largely because they're both stubborn.
Badou Nails: Badou is a dirty tomato hog.
Hattori Heiji: Was cool right up until he refused to throw the burrito at Okita's head.
Himura Kenshin: Kenshin is, of course, from Sanosuke's world. Canonically, they're best friends, and that hasn't changed in Landel's. In some ways, Sano is more protective of Kenshin because of what happened in their home. Largely though, he's confident that Kenshin can take care of himself.
Miku: Miku actually reminds Sanosuke of Karou a good bit, which means he not only likes her, but will tease her mercilessly. It doesn't help her case that she's in a relationship with Sousuke.
Okita Souji: Oh, where to begin. With recent changes, Sanosuke is more wary of Okita than he was even before, with the fragile truce in place. At the same time, he does understand the guy, and why he's doing what he's doing. The biggest problem is that Okita's attacking Kenshin, and trying to get him to break his vow or die. Since Sano isn't good with either option, it generally makes him not happy.
Sagara Sousuke: Sanosuke at the moment is taking something of a big brother's responsibility for Sousuke, since there's a pretty good chance (in his mind) that he really could be the guy's grandfather, or something. He does like the kid, even if he's a bit shut off with his feelings towards Miku. He seems pretty honorable (maybe too much so), and Sano thinks it might do him some good to relax.
Yuffie: Also known as Ninja Girl. Everything he feels for Yuffie was completely unexpected, but he really likes her. He can tell she has a good heart, even if she rushes into things and jumps to conclusions. She's generally a happy person, and very energetic, both of which Sano enjoys being around. She's confident, bold, and fun. At the moment, things are awkward between them, but that's mostly because they're both idiots in that special way.