Mr. Trololo is the main antagonist of the mod "Friday Night Incident", a mod based off the Trololo, Trollface, and Trollge memes.

Mr. Trololo's Connection To The Dearest Family

Daddy Dearest and Mr. Trololo are both former performers. In the late 1990’s - early 2000’s, DD had a world tour and was performing in Russia. While he was waiting in the green room for his cue to get on stage, he met Mr. Trololo, and after a while, they became good friends. Mr. Trololo would often visit DD when he would perform in America, and after GF was born, Mr Trololo, being almost like a brother to DD, became like an uncle figure to GF, and like an uncle, he would take care of her and treat her like family. Years pass and eventually, GF introduces BF to Mr. Trololo. Mr. Trololo welcomes BF with open arms, just as if he were already his son in law.

More facts here: https://fridaynightfunking.fandom.com/wiki/Friday_Night_Incident