Curate, connect, and discover
It would be so funny if unicron was kind of chill (I think that there is lore why he has to be evil if I remember but let's forget about cannon). And in terms of how that would affect Megatron and Starscream.
Megatron after taking dark energon: YES UNICRON'S POWER IS MINE
??: Oh not you I don't like you
Megatron: Who's there and how dare you insult me!?
Unicron: It is I the ruler of the Quintes -it's obviously me Unicron you just snorted my blood you unfunny mech. Seriously if you're going to be evil you need some intelligence at the very least.
And with Starscream (cause of the times he gets haunted by him).
Starscream: Stupid Megatron and his stupid plans
Unicron: Totally agree
Starscream: Primus is that you
Unicron: No it's his evil brother Unicron
Starscream: Oh okay
Starscream: WAIT!