Kind of late but
Lennox : they would absolutely be friends with kojo, Lennox goal to gather as many friends as he can get and that include both kojo and yu-ming. Especially yu-ming, Lennox adores and dotes on sweet people, he would probably hang out with her more, repaying her sweetness with even more sweetness.
Lennox when it comes to kojo, he would be friends but not that close but step 2, he would be kind of creepy, not like in a bad way but more of like observing with a silent smile like Lennox knows something that kojo doesn't, especially with teasing him since Lennox likes to get reactions.