Dreamy Luigi

Dreamy Luigi is a character who has appeared as a starring character. It is the form Luigi takes in the Dream World of the game Mario & Luigi: Dream Team. In this game, Dreamy Luigi forms a team with Mario to explore the Dream World and defeat Antasma.

Abilities
Dreamy Luigi's abilities in the 2-D levels on the Dream World consist of the Jump and to jump-into the Luiginary Works, which are special objects found in the Dream World. When Dreamy Luigi is near a Luiginary Work, both react to each other, causing them to be surrounded by a green light. Dreamy Luigi, then, can "possess" the object, swirling around the Luiginary Work, creating a special object that can be controlled by the sleepy Luigi, with Starlow's help.

In battle, Dreamy Luigi "zooms" into Mario, and acts as a power up to Mario's own abilities. This will boost Mario's HP by 50% and his BP by 20%, regardless of Luigi's stats. As stated, Dreamy Luigi powers up Mario's moves. When using the Jump attack, multiple Luiginoids will jump on any enemies near the enemy Mario jumps on. When using the Hammer attack, the Luiginoids will hammer the ground to create a shockwave that hits all ground enemies, getting slowly weaker as the enemies are further back.

Also, it seems that when Dreamy Luigi is in a crisis, many Luiginoids "fuse" with Dreamy Luigi, transforming him into Giant Luigi, similar to Bowser in Mario & Luigi: Bowser's Inside Story.

Personality
Dreamy Luigi is like Luigi; he's cowardly and clumsy, but sweet, brave, and loyal to Mario. He seems much more brave though. Dreamy Luigi is also manifested from not only Luigi's dreams, but his emotions and love for his brother; always willing to help him out despite the danger. It seems the love he shares with his brother, mixed in with the fear and worry is the reason why he is able to transform into Giant Dreamy Luigi.