Police said they believe there were at least three shooters: a 15-year-old, an acquaintance who died at the scene and "at least one other unknown suspect."
The arrests and charges against 39 people are part of a Houston initiative announced this time last year to combat violent crime.
Karla Morales is facing 30 years in prison after luring the victim to a field in Spring where five members of MS-13 were waiting to kill him because he disrespected them in a rap battle.
Judge Ural Glanville said that he believes the rapper's release would pose a threat to the community and said he is concerned about witness intimidation.
Michael Williams, known as Sheff G, offered money and expensive jewelry to those who carried out acts of violence, prosecutors said.
Jean-Dickens Toussaint and his wife, Abigail Toussaint, of Tamarac, Florida, were in Haiti to see ailing relatives and attend a community festival when they were kidnapped while traveling on a bus from Port-au-Prince, their family said.