マクシーム・キシン マクシーム ホァイ ホァイ! ムッムッホァイ 1マクシーム
A character from Castlevania: Harmony of Dissonance.
On NicoNico, he is treated as the most representative meme character thanks to a Tool-Assisted Superplay video. Fans nicknamed him "Mu-Mu-Hoai" as an homage to his grunt pain sounds he makes.
1 Maxim = 22.73 seconds. (Origin)