[Legolas]

He had no reason to show his strength in the Hobbit as much. He's just not really tested because of who he has to deal with. Still, it's pretty obvious how smart and strong he is. Every time something could've happened to end the mission that the dwarves/Bilbo couldn't handle, he handled it without fail.

Tricks the trolls, fights through the goblin cave, gets them out of the jam with the wolves...

From "Out of the Frying-Pan into the Fire":

And with that Ya hoy! the flames were under Gandalf’s tree. In a moment it spread to the others. The bark caught fire, the lower branches cracked.
Then Gandalf climbed to the top of his tree. The sudden splendour flashed from his wand like lightning, as he got ready to spring down from on high right among the spears of the goblins. That would have been the end of him, though he would probably have killed many of them as he came hurtling down like a thunderbolt.

From "Over Hill and Under Hill":

"Murderers' and elf-friends!" the Great Goblin shouted. "Slash them! Beat them! Bite them! Gnash them! Take them away to dark holes full of snakes, and never let them see the light again!" He was in such a rage that he jumped off his seat and himself rushed at Thorin with his mouth open.
Just at that moment all the lights in the cavern went out, and the great fire went off poof! into a tower of blue glowing smoke, right up to the roof, that scattered piercing white sparks all among the goblins.
The yells and yammering, croaking, jibbering and jabbering; howls, growls and curses; shrieking and skriking, that followed were beyond description. Several hundred wild cats and wolves being roasted slowly alive together would not have compared with it. The sparks were burning holes in the goblins, and the smoke that now fell from the roof made the air too thick for even their eyes to see through. Soon they were falling over one another and rolling in heaps on the floor, biting and kicking and fighting as if they had all gone mad.
Suddenly a sword flashed in its own light. Bilbo saw it go right through the Great Goblin as he stood dumbfounded in the middle of his rage. He fell dead, and the goblin soldiers fled before the sword shrieking into the darkness.
The sword went back into its sheath. "Follow me quick!" said a voice fierce and quiet; and before Bilbo understood what had happened he was trotting along again, as fast as he could trot, at the end of the line, down more dark passages with the yells of the goblin-hall growing fainter behind him. A pale light was leading them on.
"Quicker, quicker!" said the voice. "The torches will soon be relit."
...
Then Gandalf lit up his wand. Of course it was Gandalf; but just then they were too busy to ask how he got there. He took out his sword again, and again it flashed in the dark by itself. It burned with a rage that made it gleam if goblins were about; now it was bright as blue flame for delight in the killing of the great lord of the cave. It made no trouble whatever of cutting through the goblin-chains and setting all the prisoners free as quickly as possible. This sword's name was Glamdring the Foe-hammer, if you remember. The goblins just called it Beater, and hated it worse than Biter if possible. Orcrist, too, had been saved; for Gandalf had brought it along as well, snatching it from one of the terrified guards. Gandalf thought of most things; and though he could not do everything, he could do a great deal for friends in a tight comer.

From "The Clouds Burst":

"Halt!" cried Gandalf, who appeared suddenly, and stood alone, with arms uplifted, between the advancing dwarves and the ranks awaiting them. "Halt!" he called in a voice like thunder, and his staff blazed forth with a flash like the lightning.

Even though his Maia origins may not have been decided in The Hobbit, his personality and capabilities were just as they were in Lord of the Rings. A very wise and warm soul, but still with the ability to display strength that was unthinkable when necessary.