In issue #14 of Manhunter, Kate's old friend, Cameron Chase, begins an, um, "interesting" relationship with Kate's technical assistant, Dylan, who also acquires a new roommate, Mark Shaw, one of the previous Manhunters.
The most enjoyable comics -- or, television shows, for that matter -- are ensemble efforts, rather than solo performances. I've often felt that one of the things holding back the popularity of characters like post-Crisis Wonder Woman, Aquaman, the Flash, and the Green Lantern(s) is the continual turnover of their supporting casts.
Not that those characters are unpopular! But not like Batman and Superman, who've enjoyed comparative stability in their supporting casts for 60+ years.
One of literary devices that helps cement an ensemble cast, even one built around a central player, is the fact that the cast have relationship not only with the central player, but with one another.
Manhunter's supporting cast, one by one, develop relationship of various types with one another. That's one reason that I recommend that you...