It sounds like you're asking for a feature set or implementation plan for an — likely a fan-made or third-party tool/service inspired by LineMarvel (the LINE-sticker downloader/manager) or a similar platform for managing LINE stickers, emojis, or themes.
Since "LineMarvel" isn't an official LINE Corp product (and may refer to a previous community tool), I'll assume you want features for an alternative that respects copyright boundaries while providing utility. unnoficial linemarvel
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