Tilly is a female Hero Chao whom befriended Smerk and mated with him, bearing several dozen eggs. They stay together under Sia's care with their two surviving offspring.

Tilly's shown much better judgment than Smerk, implying higher intelligence. It's difficult to pinpoint her personality as Sia rarely communicates with her, whereas oftentimes the only way to understand Smerk's behavior is to do this.

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