The glow squid was the winner of the mob vote 2020. It is a glowing variant of the squid (as the name suggests). However, it does not affect the light level. When attacked, it squirts glowing ink. When killed, it may drop glow ink sacs, which can be used to make glow item frames and light up text on a sign. For more information, go to: https://minecraft.fandom.com/wiki/Glow_Squid