Synapse is the name of two different fictional characters appearing in American comic books published by Marvel Comics.

The first Synapse, Max Mullins, first appeared in Daredevil #377 (July 1998) and was created by Scott Lobdell and Tom Morgan.

The second Synapse, Emily Guerrero, was introduced as a new member of the Avengers Unity Squad. She first appeared in Uncanny Avengers Vol. 3 #1 (December 2015) and was created by Gerry Duggan and Ryan Stegman.

Synapse
Synapse as depicted in Daredevil #378 (August 1998). Art by Tom Morgan (penciler), Scott Hanna (inker), Christie Scheele (colorist), and Richard Starkings (letterer).
Publication information
Publisher	Marvel Comics
First appearance	Daredevil #377 (July 1998)
Created by	Scott Lobdell (writer) Tom Morgan (artist)
In-story information
Alter ego	Max Mullins
Species	Human mutate
Team affiliations	Emissaries of Evil
Partnerships	La Concierge
Abilities	Telepathy

Max Mullins is a member of the Kingpin's Emissaries of Evil who can alter the brains of others. He comes into conflict with Daredevil, who at the time was an agent for S.H.I.E.L.D. under the identity of Laurent Levasseur.^[1][2][3]

Emily Guerrero is a teenager with Inhuman heritage that was activated by exposure to Terrigen Mist. Her grandfather Ivan was also affected, and became the plant-manipulating villain Shredded Man.^[4] Later, she joins the Avengers Unity Squad under Captain America's leadership.^[5]

Both incarnations of Synapse possess telepathic abilities. The Max Mullins incarnation can alter the minds of others, while the Emily Guerrero incarnation can manipulate others' nervous systems and control their bodies.

• Synapse (Max Mullins) at Marvel Wiki
• Synapse (Emily Guerrero) at Marvel Wiki
• Max Mullins' profile in the Appendix to the Marvel Handbook
• Emily Guerrero's profile in the Appendix to the Marvel Handbook