Ok so in reguards to Lord Boxman and Professor Venemous, I have some headcanons:
Look at this gif
There’s two totally different emotions being expressed here by both of them.
My headcanon is that Venemous is a guy that’s more lacking in empathy/doesn’t know or understand how to reciprocate emotions well. He may try to understand and give emotion or the proper response to said emotion back, but its not a skill that comes easy to him. He’s had to learn skills through observation. You can see this not just in his actions (i.e. the little pat on the back that he gives Boxman as the smaller man is hugging him, it seems a bit forced/strained,) but you can also hear it in his voice. He’s more consistently monotone, even when he’s perceived to be happy or upset.
And then you have Boxman:
Boxman runs into Venemous’s arms and is very clearly happy, both shown in body language and in tone of voice. He makes his feelings very obviously to Venemous.
My headcanon for him? I think Boxman is the type to feels emotions very strongly, and will express them if given the opportunity. However, I also think that he possibly doesn’t know when enough is enough, and he tends to be an all or nothing person. If he chooses to show emotion, it’s no holds barred. If he can’t do that, he’ll bottle it all up and say nothing. He hasn’t learned how to properly regulate showing emotion at an appropriate level around others yet. When it’s just him and his bots it’s fine to be like that. However around others like Venomous there’s boundaries and limits that he has yet to learn how to recognize.
I think if both of them did end up together this is something that they could work on together. Both could learn how to properly handle their own emotions and not go overboard on either too much emotion or not enough emotion.
TL,DR: In my opinion, Venemous shows emotions less than Boxman does and struggles with reciprocating them, while Boxman is basically the complete opposite of that, and both could possibly work together on this in the future.