Supporting Jedi rarely make an impression for a number of reasons, some having to do with writing setup - ie. the main novel line's Skywalker/Solo obsession from Dark Nest onward: FotJ, nine books, number of new major characters reliably qualifying as major: 1, Vestara Khai, even the villain didn't really count. Regrettably there have been only three, three! side-novels set from 30-44 ABY, two featuring Jaden Korr and one that is essentially a short story serial about the Millenium Falcon, no short story collections, no ebook novellas. There is also the troubling problem that they really don't have much to differeniate them in terms of abilities. Since new characters generally show up only during combat, and all Jedi have similar fighting styles, and or piloting abilities, these people really aren't that different in terms of practical capabilities. As a result, this makes it very difficult for members of the Jedi Order to shine as specific role-players (this is partly a problem of having major characters who are a bit too adept in a wide-range of fields). Seha is notable not simply because she managed to show up a couple of times, but because in FotJ she did something other than swing her lightsaber at random enemies.