Mr. Tentacles looks identical to his son as he wears a brown shirt. The only differences between him and Squidward are that his shirt is a lighter shade of brown and he wears a red tie and glasses.
Not much is known about him, though Mr. Tentacles is shown to have a similar personality to his son as both have an uninterested air to them. He cares for his son as he was willing to spend time with him for the events.
Mr. Tentacles makes his physical debut appearance in the book Hooray for Dads!, indicating he is alive, contrary to what the past tense used when referring to him in "Krab Borg" may indicate. It is possible Squidward was referring to his time as a child, rather than meaning that his father was deceased.
His name is revealed in Sponge Master.
- Besides Mr. Krabs, he is the only dad in the book Hooray for Dads! who does not have a mustache.
- He and his wife have one child as mentioned in the episode "Scavenger Pants," since they both felt Squidward was enough.