Collect Data Cards to increase the chance of getting more characters or shards. They can be obtained by completing special events. You can get a free Bronzium Data Card every ten minutes. You can also spend Ally Points to get them. You will rarely get heroes from them. Log in daily for a month to collect the daily reward. A new hero will be on the rewards list each month, and can be claimed with shards. Replay hard battles to collect shards that can be spent on heroes. You can choose which character you wish to unlock. You can also get shards after completing normal battles for the first time. Earn the achievements to unlock Darth Vader. Spend Crystals on the Chromium Data Card Bundle to get Heroes and Shards. Purchase Shipments for a chance to find character shards.