>>46113652None of the E4s are memorable.
>KantoGeneric as fuck. You only recall some of them because they were in a billion KANTOOOOOOOO games (RGB, Y, FRLG and Let's Go for starters)
>JohtoGeneric as fuck again. The only one worth remembering here is Koga due to being a gym leader that became an E4 member.
>HoennThe only one here even slightly memorable is Drake due to his awesome design.
>SinnohOnly one memorable here is Flint due to his plot relevancy with some characters.
>UnovaNone of them are memorable.
>KalosNone are memorable. Malva could have been but they didn't touch on her Team Flare connections enough.
>AlolaActually memorable due to composing entirely of characters you met throughout the game rather than literal fucking whos.
If there is one issue with the Elite Four, it's that they rarely ever get enough attention outside of their battles to justify them being memorable. The only ones truly memorable either have stunning designs (Drake) or exist outside of the confines of the Elite Four (Flint, Alola E4 and Koga). Champions are exempt from this due to all being relevant in the main game prior to their battle (Blue, Lance, Steven, Cynthia, Alder, Iris, Diantha, Kukui and Hau) with the obvious exemption of Wallace who was literally who the actual fuck.