She is a multicolored Quartz fusion that is near double the size of a singular Quartz; she has thick peach hair tied into ponytails with red and yellow ribbons. She wears a sleeveless gray v-neck body suit with a dull green lace, and white shoes.
From what we have seen of Crazy Lace, she is friendly and fun-loving. She also seems to enjoy roller skating.
Thousands of Years Ago
During The Rebellion, Crazy Lace Agate's components defected from Homeworld and became Crystal Gems as a Gem Fusion. She fought in the war until its very end, when the Diamonds unleashed the Corrupting Light. Crazy Lace Agate was unable to escape the blast and became corrupted when exposed to the light.
Crazy Lace Agate is among the many Corrupted Gems that are healed, having presumably remained fused during the corruption attack, or having fused back together offscreen once healed. She appears cheerfully conversing with Zebra Jasper and Angel Aura Quartz.
Crazy Lace Agate was friends with Bismuth, another member of the Crystal Gems, before being corrupted. Once first freed from her bubble (5,000 years after being poofed and having missed the rest of the War) in the episode bearing her name, Bismuth asks about the whereabouts of some of her closest Crystal Gem friends, including "Old Crazy Lace".
There are several possibilities for the identities of her components:
Her eye gemstone resembles many varieties of Jasper, namely orbicular jasper, making this a possible identity of this component. It could also be Tiger's Eye, a bubbled Crystal Gem mentioned by Bismuth in "Made of Honor".
Her nose gemstone somewhat resembles that of the Flower Monster, making it possible that this Gem is one of her components. It also resembles the gemstone of Jasper, but appears cabochonal such as that of most Jaspers.
Either component could be a Jasper, but due to her name being Crazy Lace Agate, both components being Jaspers is highly unlikely.
She seems to be the second Quartz fusion shown after Zebra Jasper, as well as the first fully uncorrupted one.