What-Iffer is a magical glowing ball that will appear if someone (In the end bit of Twoland's case, sometwo) asks, "What if [Question]?” and it will answer the said question, or will imagine it.
He appears in
Twoland and appears again in What If?. He is voiced by Paul Kissaun.
When a character asks a "what if?" question, the What-Iffer will imagine it (as seen in "What If?") where that situation is true. the What-Iffer itself can also imagine different dimensions inside itself (as shown in Twoland).
He is the second character without a complete face; the first is
Zero, who has only a mouth. He only appeared twice in Numberblocks' eight-season run: his debut in Twoland, and his return in What If?
Zero, One, Two, Three, Four, Five, Six, Seven, Eight, Nine, Ten, Eleven, Twelve, Thirteen, Fourteen, Fifteen, Sixteen, Seventeen, Eighteen, Nineteen, Twenty, Twenty-One, Twenty-Two, Twenty-Three, Twenty-Four, Twenty-Five, Twenty-Six, Twenty-Seven, Twenty-Eight, Twenty-Nine, Thirty, Thirty-One, Thirty-Two, Thirty-Five, Thirty-Six, Forty, Forty-Five, Forty-Nine, Fifty, Fifty-Five, Sixty, Sixty-Four, Seventy, Eighty, Eighty-One, Ninety, One Hundred, Two Hundred, Three Hundred, Nine Hundred, Orders of Magnitude, Seven Thousand, Ninety Thousand
Alter-Egos Big Bad Square, The Terrible Twos, Octoblock, The Three Threes, Octonaughty, Step Squad, The Four Fours
Forty-Two, Ninety-Nine, Compound Numberblocks
Flapjack Snaffler, Blockzilla, Big Tum, Twangle
One Times Table, Two Times Table, Three Times Table, Four Times Table, Five Times Table, Ten Times Table
Fluffies, Squarey, Numberblobs, Aliens, Rainbows, Flatlanders, Alphablocks