Filis (フィリス Firisu) is a blue Ultra who appeared in the Tri-Squad VoiceDrama, a bonus material from Ultraman Taiga.
An archivist who manages old relics from past civilizations, Filis is the sole worker in his department. When Taiga was young, he became close friends with Filis. Taiga always turned to Filis whenever he was upset, or to express his frustration from living under his father's shadow. Filis was one of the few who saw Taiga as himself, not just Taro's son. At one point, Filis showed young Taiga a capsule containing the Triger Shot (a weapon used by Mebius' human form), which held memories of his exploits on Earth and the time spent with his comrades. Through this, Taiga realized it doesn't matter what others think of him, as long as he stays true to himself, and gained the inspiration to train seriously again.
- His voice actor also voiced the Alien Markind from the same series.
- He is similar to Voice, a stage show-exclusive blue Ultra who is likewise the friend of a young warrior from the lineage of Ultra Brothers.