The final scenes of Attack on Titan Season 3 Part 2 Episode 6 show Armin Arlert turning into a mindless Titan and eating a helpless Bertolt. By eating Bertolt in a Titan form, Armin became the new owner of Colossal Titan power.

Is Armin a Titan now?

After the battle of Shiganshina District, he took the power of the Titans from Bertholdt Hoover and became the Colossal Titan.

Does Mikasa become a Titan?

Because she is not a descendant of Eren's race of people, Mikasa is unable to turn into a Titan. ... Mikasa is part of the aforementioned Ackerman and Asian clan, therefore, she cannot turn into Titan. Again, this can get looked over, because the characters never address it.