First Appearance Magna Tolvan

Magna Tolvan first appears in Doctor Aphra #3.  Aphra, Aphra's father, Black Krrsantan, 0-0-0, and BT-1 are on Yavin 4 seeking clues about the mysterious Ordu Aspectu.  Their destination is the Massassi temple, location of the abandoned Rebel base that launched the attack that destroyed the Death Star.  Unfortunately Captain Tolvan is leading a contingent of Imperial soldiers who are searching the temple for information concerning the Rebellion.  Captain Tolvan believes Aphra's group could be Rebels and the Imperials are drawn away from the temple to engage them.  This is a ruse however and they are chasing Black Krrsantan while the rest of Aphra's group enters the temple.

Star Wars: Doctor Aphra #3a - Marvel Comics, U.S. (January 2017)
1st appearance of Magna Tolvan

Star Wars: Doctor Aphra #3b - Marvel Comics, U.S. (January 2017)
1st appearance of Magna Tolvan
40th Anniversary variant

Star Wars: Doctor Aphra #3c - Marvel Comics, U.S. (January 2017)
1st appearance of Magna Tolvan
David Lopez variant

Captain Tolvan is shown to be a capable leader not afraid to use the might of the Empire against her enemies.  In Doctor Aphra #4, we learn she was leading security on Eadu which was attacked by Rebels intent on assassinating Galen Erso as shown in the Rogue One movie and her punishment was to scour the abandoned Rebel base on Yavin 4.  In Doctor Aphra #5, she chases Aphra's team to the Citadel of Rur.  In Doctor Aphra #6, she and her troops are overwhelmed by ancient robots controlled by the essence of Rur but she is saved by Aphra.  A potential romance is hinted at between Tolvan and Aphra at the end of the issue.

The next appearance of Tolvan is in Doctor Aphra #14 where we learn she has been demoted to Lieutenant.  Her superior officer and peer from her academy, Captain Punfor, says: "Everyone would have thought you were most likely to succeed."  He also implies she is uptight when he tells her: "Cheer up, Tolvan!  That's always been your problem.  You could never lighten up!"  This issue is her first cover appearance.

Star Wars: Doctor Aphra #14a - Marvel Comics, U.S. (November 2017)
1st cover appearance of Magna Tolvan

In subsequent appearances, Tolvan and Aphra flirt and start a complicated, romantic relationship.  Aphra's influence morphs Tolvan into a more nuanced character, no longer believing in the dogma of Imperial rule.  At the end of Doctor Aphra #31, it appears she has joined the Rebellion.