Another one of Lila's siblings, Isai is missing both his legs.
They were damaged badly when he was young and he lost them, so now he gets around using his arms, or the help of his big (size wise, not age) brother Jace. The pair of them are very close, because when Isai lost his legs was when Jace got the scars down his haunches.

About half Lila's height, Isai generally favors her among his siblings since she's very kind about his disability, not making a big deal out of it. Despite an outwardly cheery appearance, Isai knows he's a burden and does what he can to not be useless.

Art ©  general_lii
Isai ©  jademerciful (me!)