Hmm, seems you gathered the usual first time players!
Player 2 and 3, no comments, they will be fine, and also you should rely also to their judgment as for their support.
No.1 No problem, but also take into heart that even powerful characters can fall to their deaths and so on. Next time you want to balance them, give them all the points system adjustment and let them all buy points to their characters instead of rolling them. The powerplayer will have the same possibilities as the others and canīt make a "superman" and he canīt complain since the others are facing the same restrictions.
Also, dont let him have too many magic items helping his stats to be higher and also donīt reward him too much for ordinary things. He is better than the rest and therefor it is expected of his character to do more for the same XP count. This tendancy can be handled pretty quick though and usually after some time the superheroes are not to fun to play anymore, and by all means, let them face superorcs and others. That way the balance will be kept.
Player no 4 is in my mind the most difficult though to deal with. Sure evil characters can be fun to try out but if they are evil and donīt blend in the group, think logically about it. How much does the rest of the group suffer cause of him? The ultra bad rouge sure can be fun for some time but if you donīt put up with his "stupidity" and lets him face real challanges and difficult dilemmas, he might change his mind. Itīs no fun to constanly miss the rolls and never be able to do anything right. These persons can spoil a copmplete gaming session and if he canīt make a good story for his character being as he is and plys serious, you wonīt loose that much by not keeping IMHO. Though that can be hard to make comming true in RL if he is a friend of yours. Try and talk some sense into him and tell him that you donīt want him to spoil the others gameplay.
From here you best try them out, and make the group work alot together, make them draw the heavy load of discussing and build a team here. Two players that have played alot can help your game and hopefully rub off some good qualities to the "newbies", make sure that everyone has fun though.