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 of his department, wherein a young Taiga always expressed his frustration from living under his father's shadow. The two becomes fast friends due to viewing the young Ultra as his own character and not an image of his father. At one point, Filis shows the young Taiga a capsule containing Triger Shot, a weapon used by Mebius' human form which contained his exploits with on Earth and the time spent with his comrades. This gives Taiga the determination to further train himself.
- 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.