He's named Starman. He has a pointy thing with unknown powers.He can fly. So yeah, go up against him with a wrench. Guy’s probably got a glass jaw.
The item he’s holding is the Gravity Rod, later the Cosmic Rod. It helps him get around, but it does seem to require a dedicated hand. Starman was not from the stars; he was an astronomer named Ted Knight. Wikipedia notes:
Ted Knight appears among the JSA in the Batman: The Brave and the Bold episode "Crisis: 22,300 Miles Above Earth!", voiced by Jeff Bennett. It should be noted that his voice was quite distinctive, sounding like actor Ted Knight.
Ted Baxter, Superhero!