Caines

Caines (ケインズ) is a minor character introduced in Toaru Majutsu no Index. He is a member of a small squad of Hound Dogs sent to kill Accelerator during the invasion of Academy City by Vento of the Front.

Academy City Invasion Arc
After the escape of Accelerator, Kihara Amata orders a squad of Hound Dogs to track him down and eliminate him, here, Caines becomes a part of the squad under Nancy. Their search later leads them to the Third Resource Recycling Processing Facility where Accelerator tries to find a detergent that would make their Olfactory Sensor ineffective.

However, with Accelerator being unable to use his powers due to the electromagnetic interference in the facility, he resorts to mind games and psychological warfare to kill off the Hound Dogs.

Here, Caines is separated from the team, utterly confused and vulnerable due to Accelerator using their own communication lines to sow confusion. He apparently comes upon his comrades in danger and reports to his remaining comrades that he will attempt to aid him. He is not heard from again, most likely killed by Accelerator.