[1] Ennis's stepfather Tony McIntyre, ran CIA Bounce, Toronto's premier AAU program.

As a senior at Lake Forest he averaged 23 points, 7 assists and 8 rebounds per game and was ranked one of the top 20 high school prospects in Illinois.

In his junior season at Villanova, Ennis started and helped the team win the Big East championship, complete a 33–3 record and receive a No.

[1] "I was shocked, because usually if a kid comes in and says he wants to leave, there's some problem or he's not happy," Villanova coach Jay Wright said.

[6] His arrival filled a key void for Dana Altman's Ducks at the point guard slot, who lost Pac-12 player of the year Joseph Young to graduation.

[5] After two games, Ennis broke his foot and missed the remainder of the season, while Villanova won the national championship.

[6] In his redshirt senior season, Ennis was recognizable due to a streak of blonde hair his girlfriend dyed on him as well as his energetic play.

[7] On July 14, 2017, Ennis scored 35 points during the Warriors' 109–100 Summer League victory over the Los Angeles Clippers.

[10] On December 9, 2017, he left Mega and signed with Serbian club Crvena zvezda until the end of the 2019–20 season.