Barret is a playable character in Final Fantasy VII. In Final Fantasy VII: Advent Children, Tifa takes care of his daughter (Marlene) while he travels the world searching for energy sources alternative to Mako. He appears to help fight Bahamut Sin.

Two years after the end of Final Fantasy VII the world is starting to get back on it's feet and is working towards a new future. However, there is a new threat from a new illness called Geo-stigma, and three men that seem to be seeking Jenova. Cloud and his friends from the orginal game must once again reunite to combat the new threat.
 
(Source: Anime News Network)

Beau M. Billingslea is an American actor and voice actor. He is best known as the voice of Jet Black from the popular anime Cowboy Bebop. In addition to voice acting, Billingslea has appeared in many popular TV series as a prolific guest actor. Before he got into acting, he played football at the University of Connecticut.

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Masahiro Kobayashi is a retired Japanese voice actor and actor who is most known for portraying Barret Wallace in the Japanese versions of Final Fantasy VII Advent Children and Dirge of Cerberus: Final Fantasy VII as well as portraying Teruaki Takeda in the tokusatsu film Godzilla, Mothra and King Ghidorah: Giant Monsters All-Out Attack. He has also appeared in Seija No Koushin as Tatsuo Inose, Hajime No Ippo as Jason Ozuma and GTO: Great Teacher Onizuka as Hajime Hakamada.

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AC: Complete contains a considerable amount of new footage that the original version lacks, as well as roughly a thousand revised scenes. This adds a total of 26 minutes to the film. 
Some of the new scenes include a more in-depth look at the Geostigma, Denzel and Kadaj's origins, as well as an extended fight between Cloud and Sephiroth. 
The Japanese release of this edition features a new ending track from Kyosuke Himuro called "Safe and Sound", with additional lyrics from My Chemical Romance frontman Gerard Way. The track replaces Himuro's previous track "Calling" from the original cut of the film. However, in the North American release, the song "Calling" remains, and "Safe and Sound" is absent. 
(Source: Wikipedia)

'On the Way to a Smile' is a series of short stories taking place between the time of Final Fantasy VII and Final Fantasy VII: Advent Children.