Last vs. Latter

Although latter is sometimes used to refer to the last of three or more things, it should technically only be used to refer to the second of two things. (Remember that its usage follows the pattern of comparative adjectives like better and quicker, which are used when comparing only two things.)

Batman, Superman, and Aquaman all have terrible taste in music, but the latter has the worst taste.

Batman, Superman, and Aquaman all have terrible taste in music, but the last has the worst taste.

Superman and Aquaman both have terrible taste in music, but the latter‘s taste is worse.