With El, he's possessive and single minded (don't know if im using that right) he try to have all the attention of El for himself but not into a cute way, because El want to communicate with others (Season 3, Max). From my other post i forgot to say that in season 4 it is implied that they aren't that close, I mean they don't really communicate and the only time we saw them alone in S3 was when they were kissing (don't say this is how functional relationship work, because relationship are about communication and trust, they're is trust but no communication) and when they were all together, the moment when they try to talk alone it always get weird and even the watcher can feel it, they don't know how to talk to each other (don't say it's because they're teenagers in love because Max and Lucas even with they're on/off things communicate so much better than them). With Will, he's more compassionate, calm, understanding/listening, Mike always and i mean always listen to Will, when he has an idea Mike is always on board to do it (Will to for Mike), Mike has the Will voice/eyes, the trust between them is magnificent, and their communication is always the best between the all group (well beside when mike is angry in french we say "têtu comme une mule"). What make me blow away is that when El want to do something Mike is always "are you sure", "you shouldn't do that" but when it's Will it's always like "Im not sure we should do this but i believe in your capacities and just to make sure i will stay beside you", people might say that Mike is just protective of El but i don't see it that way, it's like he's trying to "father" her, tell her what she has to do. While with Will even if he's not sure of what's going to happen he let him do what he think is right but stay beside him like a safety net. (😏😏Vol 2😏😏).