Mara

Mara is the first half of MaXi. She forms the right half and her left arm/leg disappear when she merges with Xilo.

http://www.mediatoon-distribution.com/en/catalog/267/maxi/ video calls her "the commited one".

In Vagues de contestation photos on the wall show that she and Xilo have been attaching since babies.

Her yellow octopus/squid dream figure is Pieuvre.

Age
She is the younger sibling since as she puts it "you just managed to get your hand out before mine". Later in Le jour des totems Xilo refers to her as "petite soeur" (little sister).