Semi-colons allows multi-crew search
(i.e. "data;spock")
Tiers and comments come from /u/Automaton_2000's work, with his permission.

Tiered Crew List

Tier 1

Combat Medic Paris
Mintakan Troi
1
Mirror Jadzia Dax
Mirror Phlox
1

Tier 2

Alan-A-Dale
2
Armed Philippa Georgiou
2
Assimilated Tuvok
2
Friar Tuck Data
1
Mirror Geordi La Forge
1
Mirror Mayweather
Princess Jadzia
1
Prospect Michael Burnham
Sarek
2
Sarina Douglas
1
Torchbearer Voq
1
Tourist Quark
1
Tsunkatse Seven
1
Vulcan Wedding T'Pol
1

Tier 3

Ardra
Captain Janeway
Celebratory Ash Tyler
Changeling Bashir
1
Graduation Michael Burnham
Katra McCoy
2
Klingon O'Brien
2
Marshal of France Q
1
Mutated Paris
Niners Rom
3
Nurse Faith Garland
Prisoner O'Brien
1
Prospero Data
RAF Julian Bashir
3
Tieran Possessed Kes

Tier 4

Ambassador Sarek
2
Ambassador Shras
1
Bajoran Dukat
3
Captain T'Pol
1
Doc Crusher
2
Doctor La Forge
2
Dr. Hippocrates Noah
2
Gabriel Bell
Grand Proxy Neelix
1
North Star Archer
1
Robin Hood
1
Roga Danar
2
Sheriff Worf
2
Tactical Michael Burnham
1
The President of Earth
3
Victorian Pulaski
1

Tier 5

1701 Jadzia Dax
Admiral Picard
1
Age of Sail La Forge
1
Augment Riker
3
Author Doctor
3
Ba'ku Worf
Drone Seven of Nine
1
Human Q
Profitable Ishka
2
Rianna Mayweather
1
Subcommander T'Rul
2
Sybok
2
Time Loop Mudd
Undercover O'Brien
2

Tier 6

Advocate Kolos
1
Alidar Jarok
2
Commander Chapel
2
Commander Ellen Landry
Commander Keras
2
Dahar Master Kor
1
Mirror Janeway
2
Mirror Tucker
1
Rakal Troi
1

Tier 7

Blood Oath Jadzia Dax
Chief O'Brien
2
Disguised Tuvok
1
General Martok
2
Holonovel Doctor
1
Kal-if-fee Spock
1
Klingon Torres
Kurak
1
Lieutenant Valeris
1
Mirror Jennifer Sisko
Reinforcements Stamets
Romulan Kirk
1
Young Khan
1

Tier 8

Ambassador K'Ehleyr
Ambassador Spock
2
Apollo
1
Dominion Dukat
2
EV Suit Tucker
1
First Goran'Agar
1
First Officer Saru
Icheb
2
Lt. Ash Tyler
Nexus Kirk
1
Niners Kira Nerys
2
Platonian Kirk
1
T'Mir
1
Temporal Agent Seven
1
Waitress Ezri
Xindi Prisoner Archer

Tier 9

Anastasia Komananov
1
Antaak
1
Bridge Officer Troi
Buster Kincaid Kim
1
Command Hologram
Commander Thelin
Dr Crusher
1
Dr. David Marcus
2
Dr. Gillian Taylor
1
Galen
Gralik Durr
2
Klingon Neelix
Lal
Liaison Torres
1
Lily Sloane
1
Mirror K'Ehleyr
1
Mirror Leeta
Rogue Harry Kim
1
Ruk
Rura Penthe Reed
Tash
1
Vedek Bareil Antos
Warship Janeway

Tier 10

Captain Q
Commander Barak
Commander T'Pol
1
Commander Tomalak
2
Drafted McCoy
1
Duelist Yar
Kazon Seska
1
Malik
1
Marla McGivers
Mirror Garak
1
Pel
1
Trader Odo
Weyoun Clone 4
1

Tier 11

Angel I Riker
Berlinghoff Rasmussen
Captain Proton Paris
1
Cardassian Kira
1
Civil War Worf
Claiborne Chekov
1
Colonel Karr
1
Commander Kelby
1
Commando Shran
1
Cyrus Redblock
1
Detective Dixon Hill
1
Formal Dress Wesley Crusher
Kurros
1
Laas
M-113 Creature
Mirror Uhura
Riley Frazier
1
Tommy Gun Dixon
1
Tuskegee Mayweather
1
Warship Chakotay
1
Warship Yar

Tier 12

Anbo-jyutsu Riker
Arik Soong
Bestselling Author Jake Sisko
1
C.O.P. Founder Archer
1
Captain Klaa
Captain Sulu
1
Commander Nevesa
1
Commander Sela
1
Defiant Commander Worf
Dr. Toby Russell
1
Dr. Tolian Soran
1
Duchamps
1
Edith Keeler
1
Fesek
1
Gorn Captain
1
Hologram Barclay
1
KDF Gowron
1
Kilana
Klingon Quark
1
Lore
Maquis Ro Laren
Mirror Ezri Tigan
Mirror Vic Fontaine
Professor Scott
Resistance Shakaar
1
Stranded Odo
Vic Fontaine

Tier 13

Agent Harris
Anij
Cadet Wesley Crusher
Captain Kurn
Commander Dolim
1
Danara Pel
1
Forra Gegen
Lieutenant Arex Na Eth
Lieutenant Tarah
Luther Sloan
Mirror Archer
Mirror Empress Sato
Mirror Sisko
Mother Horta

Tier 14

Amanda Grayson
Automated Unit 3947
Captain John Harriman
Commander Uhura
Doctor Chapel
1
Feezal Phlox
Fencing Sulu
GI Chakotay
Lon Suder
Maquis Eddington
Martia
Miral Torres
Orion Slaver
Silik