Thor, the strongest Avenger. He's really the dude they need to lean on in every battle, because he's on a whole other level. Last time I checked, he's the only God on the team. I mean, Thor is the type of guy who gets excited about fighting the Hulk. That means something. In fact, he's the only reason they beat Thanos in the 'Infinity War' movie, and sure that's just the Marvel Cinematic Universe, and sure, Thanos ultimately won, but a few inches higher and Thor would have been 100% victorious instead of 98% victorious.
You can't blame Loki, Thor's half brother, for being jealous of Thor. Everybody loves Thor, especially Odin. Loki had no choice but to be evil. What else was he going to do? Be second place? I'd rather be first the worst than second best.