Talk:International Events/Tsum Tsum Sweetheart/@comment-2600:1700:7E00:6600:ADC1:36BA:DE9E:5CC6-20180209164223/@comment-758433-20180210145401

You change the colour of the capsules by hitting them with Bubbles or burst skills. Which means your MyTsum can be any of the Happiness box Tsum Tsum (or Rabbit who also works).

As for recommending one of them: Christopher Robin's balloons might hit one capsule without hitting the other.