Neznaika

Dunno, or Know-Nothing or Ignoramus (Russian: Незнайка, Neznayka that is Don'tknowka (ka - the Russian suffix here for drawing up the whole name in a cheerful form); from the Russian phrase "не знаю" ("ne znayu"), I don't know) is a character created by Soviet children's writer Nikolay Nosov.

Dunno, recognized by his bright blue hat, canary-yellow trousers, orange shirt, and green tie, is the title character of Nosov's world-famous trilogy, The Adventures of Dunno and his Friends (1954), Dunno in Sun City (1958), and Dunno on the Moon (1966). There have been several movie adaptations of the books.

His names were translated differently in various languages:

The three fairy tale novels follow the adventures of the little fictional childlike people living in "Flower City". They are described to be sized like "medium cucumbers", a quality that has earned them the name "shorties" or "mites". All fruits and vegetables growing in Flower City are, however, their regular size, so the Shorties invent sophisticated methods of growing and harvesting them. In Nosov's universe, each shorty occupies his/her own niche in the community and is named accordingly.

In Flower Town, Dunno gets into heaps of trouble. First, he becomes convinced that the sun is falling and manages to scare half the town before Doono, Dunno's brainy antithesis (his name is derived from the Russian "знаю", I know) clears everything up. Then he proceeds to try music, art, and poetry, but his unorthodox endeavors only irritate his friends, and he is forced to quit. Next, ignoring the warnings of Swifty, Dunno crashes Bendum and Twistum's car into the Cucumber River and ends up in the hospital. He then gets into a fight with his best friend Gunky for not ending his friendships with the girl-shorties Pee-Wee and Tinkle.

Doono proposes to build a hot air balloon and go on an adventure. He and his friends begin extracting rubber, weaving the basket, and making emergency parachutes out of dandelions. A large rubber balloon is then inflated, fastened to the basket, and filled with hot air. The parachutes and other supplies are loaded, and sixteen seats are accommodated for. Everyone helps with preparations except for Dunno, who is too busy bossing everyone around and providing useless advice. The day of the departure comes, and Doono, Dunno, and fourteen other Mites come on board. Shot takes with him his dog, Dot. By this time, half the town still does not believe the balloon will be able to fly, but the balloon successfully rises off the ground, and all the shorties of Flower Town cheer. Gunky waves to Dunno from the ground but Dunno shuns him.

...
Wikipedia