By earning more and more Rhythmia, you can earn colored Crystal Shards to help you unlock more characters.

Character	Rhythmia
Crimson Shard	41,000 Rhythmia.
Crimson Shard	16,000 Rhythmia.
Crimson Shard	91,000 Rhythmia.
Crimson Shard	70,500 Rhythmia.
Golden Shard	86,500 Rhythmia.
Golden Shard	99,000 Rhythmia.
Gray Shard	61,000 Rhythmia.
Gray Shard	83,500 Rhythmia.
Green Shard	55,500 Rhythmia.
Green Shard	43,500 Rhythmia.
Green Shard	27,000 Rhythmia.
Indigo Shard	68,000 Rhythmia.
Indigo Shard	42,000 Rhythmia.
Indigo Shard	22,500 Rhythmia.
Orange Shard	3,500 Rhythmia.
Orange Shard	6,500 Rhythmia.
Orange Shard	25,500 Rhythmia.
Orange Shard	29,500 Rhythmia.
Orange Shard	9,500 Rhythmia.
Purple Shard	92,500 Rhythmia.
Purple Shard	80,500 Rhythmia.
Rainbow Shard	39,000 Rhythmia.
Rainbow Shard	89,000 Rhythmia.
Red Shard	59,000 Rhythmia.
Red Shard	53,000 Rhythmia.
Red Shard	67,000 Rhythmia.
Scarlet Shard	33,000 Rhythmia.
Scarlet Shard	8,500 Rhythmia.
Scarlet Shard	5,500 Rhythmia.
Scarlet Shard	2,500 Rhythmia.
Scarlet Shard	18,000 Rhythmia.
Silver Shard	12,500 Rhythmia.
Silver Shard	78,500 Rhythmia.
Silver Shard	49,000 Rhythmia.
Silver Shard	37,000 Rhythmia.
Turquoise Shard	14,000 Rhythmia.
Turquoise Shard	74,500 Rhythmia.
Turquoise Shard	63,000 Rhythmia.
Turquoise Shard	47,000 Rhythmia.
White Shard	72,000 Rhythmia.
White Shard	81,500 Rhythmia.
Yellow Shard	5,000 Rhythmia.
Yellow Shard	1,500 Rhythmia.
Yellow Shard	21,000 Rhythmia.
Yellow Shard	36,000 Rhythmia.
Yellow Shard	8,000 Rhythmia.