How are the characters connected to the original game in Danganronpa:UDG? During Danganronpa: Ultra Despair Girls we are told that the people selected to be hunted are related to the characters in the original game.

Some of these are relatively straight forward, but it's been a while since I've played the first game so some links are lost on me.

How are the new characters related to the old ones?
A lot of the links can be found if you go on the wiki. The targets were all the most important person to their corresponding character from the first game.
For Example, Hiroko Hagakure is Yasuhiro Hakagure's mother, and Yuta Asahina is Aoi Asahina's brother. But, not all of these figures are human. Celestia Ludenburg's most important person was her cat, and Touko Fukawa's was a bug.