This article contains lore created collaboratively by the Blaseball community. It is just one of many Rumors that we've found in the Interdimensional Rumor Mill. You can find more Rumors about Rat Mason at their Rumor Registry.
Mech Suit Mason
Rat Mason (née Polk) dreamed of being a Broadway star, but their diminutive stature left them frequently stuck at the end of the chorus line. After making friends with the technical crew to pass the time, Rat became adept at creating elaborate mechanical costumes, and soon graduated to full-body suits which completely obscured the wearer. Over time, Rat amassed an impressive and diverse collection, which they began wearing all over New York, delighting in the simple pleasures of performing normal-sized tasks like riding a rollercoaster or climbing a ladder. After a moderate disagreement about the destructive capacity of these suits (which is yet unknown), Rat decided to abandon the theatre and the Big Apple entirely, setting their sights on Los Angeles and the emerging splort of Blaseball.
Since joining the Tacos, Rat has rarely been seen outside one of their suits, and only by teammates and close associates. The appearance of Rat’s suit varies from game to game, but is typically modeled after humans, rats, or some combination of the two. This has led to wild speculation among the general public as to who (or what) is actually piloting these things. When asked who was inside the suits, McDowell Mason replied, “That's [Rat's] business, not yours,” and quickly walked off. Reports of Rat maintaining an armory of mechanized suits in their basement are unconfirmed at this time.
Many Blaseball fans theorize Rat to be either a human in a mechanical rat suit or a rat in a mechanical human suit. The former is supported by a few details from their past. In a series of interviews conducted by an investigative journalist from a local middle school’s bi-monthly newsletter, Rat’s old friends from New York described him as “shy,” “really, really, like comically small,” and “no not a literal rat, what in the world are you talking about.” They also disagreed over whether Rat was Mason’s actual first name, with some referring to it as nickname and one particularly confused woman claiming it was short for “Ratrick.”