List of Teen Titans members
Original Team (1960s–1970s)

Character
Identity
Issue joined
Notes
Robin / Nightwing
Dick Grayson
The Brave and the Bold #54 (July 1964)
Founding member. Leader of the Titans.
Kid Flash / Flash
Wally West
The Brave and the Bold #54 (July 1964)
Founding member. Former member of the Justice League of America, the Justice League Elite, and Justice League Europe as the Flash.
Aqualad / Tempest
Garth
The Brave and the Bold #54 (July 1964)
Founding member. Died in Blackest Night #2. Disappeared after New 52 relaunch but reappeared in DC Rebirth.
Wonder Girl / Troia
Donna Troy
The Brave and the Bold #60 (June/July 1965)
Founding member. Former member of the Darkstars as Donna Troy.
Speedy / Arsenal
Roy Harper
Teen Titans #19 (January/February 1968)
Founding member (retcon introduced in Teen Titans #53 (February 1978)). Former member of the Outsiders and Checkmate as Arsenal.
Lilith / Omen
Lilith Clay
Teen Titans #25 (January/February 1970)
Leader of Titans West. Died in Titans/Young Justice: Graduation Day #3. Reestablished in Titans Hunt (second series) #1.
Hawk
Hank Hall
Teen Titans #25 (January/February 1970)
Also a member of Titans West. Became the villains known as Monarch and later Extant.
Dove
Don Hall
Teen Titans #25 (January/February 1970)
Also a member of Titans West. Died in Crisis on Infinite Earths #12.
Guardian / Herald
Malcolm Duncan
Teen Titans #26 (March/April 1970)
Also a member of Titans L.A. Member of the Doom Patrol as Vox.
Aquagirl
Tula
Teen Titans #30 (November/December 1970)
Honorary member. Many of her adventures with the Titans are uncatalogued. Died in Crisis on Infinite Earths #10.
Gnarrk
John Gnaark
Teen Titans #33 (May/June 1971)
Also a member of Titans West. Reported dead.
Joker's Daughter / Harlequin
Duela Dent
Teen Titans #46 (February 1977)
Former member of Titans East as the Joker's Daughter. Killed by a Monitor in Countdown #51.
Bumblebee
Karen Beecher-Duncan
Teen Titans #48 (June 1977)
Also a member of Titans L.A. Member of the Doom Patrol.

Question: Who joined Teen Titans West in 1970?
Answer: Gnarrk and Lilith joined Teen Titans West.