Super Mario Galaxy 3

Er...no.
Her soulmate/love interest/possible hubby/etc. (about the same age and all) as found out in the ending.

I like how the SMG games simplify the 3D Mario formula like that. It's said that Super Mario 3DS is SM64 + SMG, but we'd have to wait till E3 to be sure of more of it.

Since Indigo just added to his own idea, I'll keep this topic going more.

NPCs

Somewhere in the Shooting Star are several small rooms called passenger quarters, which house various types of NPCs, all the ones from the last two games. (Piantas and Nokis will also show up in there after some levels)

Plus a few more new ones:

Krog: Cavemen whose bodies and heads are made entirely out of stone. They tend to say "krog" a lot in their speech.

Desert Wisp: Shadow-like creatures who wear desert veils over their heads. They give Mario advice too in some levels, but saying it in a very dark, subliminal way.

Here they both are: i82.photobucket.com/albums/j265/BooDestroyer/SMG3_NPC.jpg

Tigrett and Grizzlow: Just like the Jibberjays and Fluzzard of SMG2, the Tigretts (small sabertoothed tiger characters that stand on their hind feet) challenge Mario to a grizzly bear-riding challenge in some galaxies. Grizzlow is that bear. Guide him through the obstacles to the goal while riding on his back to clear the challenge. Later on, you'll be challenged to a race with a white Tigrett.

(No images of them yet)

E. Gadd: Surprisingly, he makes an appearance (later in the game) on board the Shooting Star too! What he does this time is manage a special simulation room in the ship, where you can give each of all the power-ups a test drive, and put them to use in obstacle courses of varying difficulties.

Pikmin: Pikmin?! Yes, of all the cameos, they (all three of the main colors) appear in a later galaxy in the Special World. (Pikmin and SMG both have their roots in the old Mario 128 deal, so if there had to be a cameo in this game, they'd be the choice for it.)

Bosses

Putrid Piranha: A giant flower Piranha Plant (like the other two before), but residing in a huge puddle of slimy, smelly goo. Primarliy attacking by spitting out said goo at Mario. He will often bounce around outside of the pool, going after Mario. Use the spin move on his bloated underside to damage him.

Hammerjack: A gigantic Sledge Bro in black gear, attacking with two large hammers by swinging them at Mario. Also attacks by jumping in the air and doing body slams. Later when he's down to his last hit, he calls in Hammer Bros and Boomerang Bros to back him up.

Magnetoid: A robot made entirely out of magnets used by Bowser Jr. It can throw heaps of junk and scrap metal at you as its main attack. Use the Metal Mushroom (Metal Mario, stronger than usual!) to get onto him an ground pound him on the flashing red light on its chest.

Chameleander: A chameleon who changes colors and hides in different-colored trees. Mario rides Yoshi for this battle. When it goes invisible, the color it shifted into last will be the tree it hides in. Shake to knock down Chameleander and spit out Spiny Eggs at it to defeat it. (If you get the wrong tree, it'll get you with its tongue)

Quillvian: A large green bird who flies around a planet to attack Mario. It does so by spitting eggs and shooting feather. Later on, it then comes down to the ground, walking after Mario, and then jamming its beak into the ground, and you have to spin to attack when it gets stuck in there, similarly to the Helmaroc King in Zelda: The Wind Waker.

Rollodillo: Returning from SMG2. Same procedure as before, just get him with the Rock Mushroom.

Octolossus: A giant creature made entirely out of Octoombas. Its hands, feet, chest, head...all Octoomba heads, and fires rocks with them. They shoot mostly fiery rocks, but there's the occasional coconut in which you most spin to knock it back at it, which will knock out one of its heads. When all heads are defeated, this boss goes down.

Cheep Chieftain: A giant mustachioed Cheep Cheep with a crown. This is an underwater battle, and he'll come after you by trying to swallow you by opening his mouth whole and lunging after you. You have Koopa shells to help you take him out and get away from him faster. When his mouth is open, you throw the shell into him to damage him.

Krogosaurus Rex: A large stony dinosaur, with a Krog-like style, and causing the Krogs misery. The Cloud Flower may come in handy here. Go above and ground pound this boss to take it down.

Olmecha: A giant stone head (loosely based on the ancient Olmec civilizations) that shoots projectiles out of its mouth. The Fire Flower will come in handy here.

Big Bob-Omb: In another throwback galaxy, based on Bob-Omb Battlefield, this guy is back, but throws around Bob-Ombs to fight. You must throw them back at him to defeat him.

Dry Bowser: Instead of regular Bowser a second time, the end boss of World 4 is Dry Bowser (after his lava demise in World 2). He'll shoot a few fireballs at you first. Now, drop him once with a spin attack when he rolls into a spike ball towards you (similar to SMG1's Bowser battles) to stun his body, but his head will bounce around after you. If you're not careful, it'll latch/bite onto Mario's head, slowly losing his health (spin to get it off). When his head is going amok, you have to use your spin attack on it to damage Dry Bowser. The head then goes back to the body and the process repeats again (He'll then be revived back to regular Bowser in World 6)

Blaze Quillvian: Same as before, but it's on fire. And when it strikes and gets its beak stuck, you'll have to wait till the fire on its head goes out to attack.

(Images coming soon)