Spearman feels like a chill bro to have under different circumstances but it is what it is.
Beatrice on the other hand, her "plan" feels more like a "I'll act like I'm here to kill a bitch but he ain't a bitch he my lover", but it seems like she's a bit of a smoothbrain.
No one can tell what Hiyama's plans are because her love too strong and makes her extremely emotional to the point where it makes her seem bad. That and she seems a little two-faced? But I'm sure it's the hardcore tsun at work there.