Table:
0
A
B
C
D
E
1
Character
Portrayed by
Relationship
First appearance
Last appearance
2
Reed Garrett
Kyle Gallner
Son of Mac Taylor's late wife
"Consequences"
"Pot of Gold"
3
Rikki Sandoval
Jacqueline Piñol
Neighbor of Danny Messer
"Child's Play"
"Personal Foul"
4
Samantha Flack
Kathleen Munroe
Sister of Don Flack
"Veritas"
"Misconceptions"
5
Terrence Davis
Nelly
Informant of Don Flack
"Turbulence"
"Cuckoo's Nest"
6
Ellie Danville
Sydney Park
Adopted daughter of Jo Danville
"Do Not Pass Go"
"2,918 Miles"
7
Russ Josephson
David James Elliott
Ex-husband of Jo Danville
"To What End?"
"Identity Crisis"
8
Claire Conrad Taylor
Jaime Ray Newman
Late wife of Mac Taylor
"Indelible"
"Near Death"

Questions and formulas:
Question: Which characters had their first experience in the episode "consequences"?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1="Consequences"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E8,D2:D8="Consequences"),1))
Level: medium
Question: What episode had the last appearances of the late wife of mac taylor?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="Late wife of Mac Taylor"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E8,C2:C8="Late wife of Mac Taylor"),5))
Level: medium
Question: Which characters were portrayed by reed garrett?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="Reed Garrett"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E8,A2:A8="Reed Garrett"),2))
Level: medium
Question: How many characters were portrayed by the informant of don flack?
Formula: ROWS(UNIQUE(FILTER(B1, C1="Informant of Don Flack")))
Formula2: ROWS(UNIQUE(FILTER(B2:B8, C2:C8="Informant of Don Flack")))
Level: medium
Question: What episode was the last appearance of the character, rikki sandoval?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="Rikki Sandoval"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E8,A2:A8="Rikki Sandoval"),5))
Level: medium