When he was a cub, he was shown to be good friends with King Louie when he was only a prince. This friendship was endangered when Baloo spent more time with another bear he recently meet. Both as a cub and a full grown bear, Baloo is lazy and laid back. He loves to dance and play games. He hates becoming upset and having to be strict. He also enjoys being around Mowgli, Baloo thinks of Mowgli as his son just as Mowgli thinks of Baloo as his father.
Weight GainBaloo did not gain weight in either of the movies, however he did briefly get bloated after eating pears with another bear while he was a cub in "Jungle Cubs" episode "Hulla Baloo". Which can be watched here: http://www.youtube.com/watch?v=J0c1HFbAYqU
Baloo also gained weight as an adult bear after eating large amounts of Caloberries in a fanfic by comicfan67 on deviantart.com. The chapters of the story can be found here: http://comicfan67.deviantart.com/gallery/?q=jungle
Another fanfic written by comicfan67 depicts Baloo gaining weight along with Mowgli and Ranjan. Both the fanfic and an illustration of it by mothman64 can be found here: http://mothman64.deviantart.com/art/Jungle-Book-Weight-Gain-302871695