Which virtue did each Heartiel stand for?
According to the Precure wikia, the list of Heartiels and Virtues are:

╔══════════════════╦══════════════╦════════════════╗
║       Name       ║    Virtue    ║     Symbol     ║
╠══════════════════╬══════════════╬════════════════╣
║ Eternalun        ║ Eternal      ║ Pocket Watch   ║
║ Lovelun (rabrun) ║ Love         ║ Ring           ║
║ Prosen           ║ Prosperity   ║ Pear           ║
║ Pyuan            ║ Purity       ║ Snowflake      ║
║ Inteligen        ║ Intelligence ║ Book           ║
║ Wishun           ║ Wish         ║ Mirror         ║
║ Braven           ║ Bravery      ║ Crown          ║
║ Harmonin         ║ Harmony      ║ Treasure Chest ║
║ Hapinen          ║ Happiness    ║ Bell           ║
║ Horpun           ║ Positivity   ║ Key            ║
║ Pation           ║ Passion      ║ Torch          ║
║ Seekun           ║ Seek         ║ Telescope      ║
╚══════════════════╩══════════════╩════════════════╝