Disney+'s Marvel series have introduced a host of new characters to the Marvel Cinematic Universe. Many of them originated in Hawkeye, such as Kate and Eleanor Bishop, Kaz, and Jack Duquesne. Perhaps most importantly, the show introduced Maya Lopez, also known as Echo, the leader of the nefarious Tracksuit Mafia.
Source:https://www.cbr.com/marvel-echo-maya-lopez-disney-plus-underrepresented/