Tochtli

Tochtli is a minor character of the magic side of Toaru Majutsu no Index. She is a member of Return of the Winged One and is usually regarded as Xochitl's partner.

Toaru Kagaku no Railgun
Her first appearance is when she uses a Mixcoatl to retrieve the stranded Xochitl from Liberal Arts City. She notes on how Saten Ruiko is kind and seemed genuinely worried over Xochitl. Later, when the fight against Liberal Arts City climaxes she chooses to support Xochitl stance of leaving civilians evacuate, rejecting their direct orders; even though this meant fighting off people from her own Magic Cabal who where following orders obediently.

DRAGON(≠Angel) Arc
Tochtli first appeared in volume 19 when GROUP was riding Shiokishi's base. She is seen along Tecpatl; however she "wasn't conscious" since Tecpatl saw the need of sedating her to the point where she was unable to talk in order to freely use her bones as materials for the attacks of his Grimoire without objection.

After seeing the situation, Etzali decides to face Tecpatl and once he defeats him, he decides to use his grimoire to restore health to Tochtli, thinking on Xochitl's bests interests.

Homecoming
Tochtli is seen recovering, interned in the same hospital and staying in the same room as Xochitl, there she jokingly points out how Etzali's presence is of great help to them and seems to read quite easily Xochitl mood swings and her feelings towards Etzali, hence she easily uses such quality to "add fuel to the fire" of their arguments. Tochtli also calls Etzali "onii-chan", however it seems that she does this only to get in Xochitl's wrong side rather than affection towards Etzali.