Come on... Jar Jar Binks (star wars), Donkey (Shrek), Zenitsu(Demon Slayer), Dory (Finding Nemo/Dory), Pain and Panic (Hercules), Might Guy (Naruto). These characters give something called comic relief which usually are brought in tense scenarios to break the tension.
If that doesn't give at least a simple idea I'm not sure I can go on