An (erupting) lissandra skin

Design - Lissandra's dress could be (of course ) a volcano, The headress she wears on her head could be tribal-like, but instead of feathers it could be a fiery looping rain kind of thing. The shoulder pads following the tribal like pattern on lissandra's headress. Lissandra's neck brace thing could be the bottom half of a wooden tiki torch. Lissandra's body could be smoke/ashe, since volcanos tend to erupt more smoke than anything.

Abillities-

Passive [ice born] make her headress glow

Q [Ice shard] could be volcanic rock breaking into shards

W [ring of frost] can be a burst of lava that snares enemies with volcanic rock.

E [glacial path] can be a volcanic rock hand that flows while lava/firey path spews from behind

R [frozen tomb] Lissandra traps herself/enemies into a volcano that erupts, bursting a pool lava around it.

Extra things

Dance - lissandra can do a hawaiian hula dance.

Recall - poros climb lissandra's volcano sacrificing a poro snack to awaken lissandra

Once poro snack falls into volcano, lissandra returns to base coming out of the volcano.

Death - the volcano dies and crumbles up into diamonds or obsidian