A list of holograms appearing in Reginald Barclay's holoprogram #15. (TNG: "Hollow Pursuits")
Unnamed characters
The Three Musketeers
The Three Musketeers were holographic representations of Captain Picard, Data, and Geordi La Forge. Barclay would fight them in a fencing match and defeat all three of them at the same time.
While looking for Barclay, La Forge, Deanna Troi and William Riker came upon the them. Musketeer Picard opined on the disagreeable nature of the real crew. The three challenged them to a fight. (TNG: "Hollow Pursuits")
Boy at the Picnic
The Boy at the picnic was a hologram of Wesley Crusher. He was enjoying a picnic with his mother. He was ill-mannered and the mother chided him, saying that "Master Barclay" would spank him if he misbehaved.
Barclay resented that fact the Wesley made fun of him by calling him Broccoli and represented him as ill-mannered and a slob.
(TNG: "Hollow Pursuits")
Goddess of Empathy
Troi hologram as the Goddess of Empathy
The Goddess of Empathy was a representation of Deanna Troi, who Barclay had a crush on. In one scene he and the goddess had a romantic kiss. When Riker, Troi, and La Forge entered the program to find Barclay, they were greeted by the goddess, who was spewing romantic, soothing rhetoric. When asked were Barclay was, the hologram began to hit on all of them. (TNG: "Hollow Pursuits")
Muskateer Number One
Musketeer Number One was a holographic representation of William Riker. Number One was a bumbling fool who was very short in stature, and stumbled up to the crew hunched over and screamed "EN GARDE!"
This hologram was designed by Barclay because Riker was very strict with him. The shortness of the hologram gave Barclay the opportunity to cut him down to size. (TNG: "Hollow Pursuits")
Woman on a Swing
The Woman on a Swing was a representation of Dr. Crusher. She was enjoying a picnic with her son. She told La Forge that Barclay got into a bit of a scrap. La Forge found him fighting The Three Musketeers. (TNG: "Hollow Pursuits")