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やつ is casual and can be rude depending on context. When referring to people:
- Friendly: あいつはいいやつだ (He's a good guy)
- Hostile: あのやつ、許せない (That jerk, I can't forgive him)
When referring to things (sense 2), やつ is simply casual with no negative connotation.
Forms
- こいつ: this guy (close/rude)
- そいつ: that guy (close/rude)
- あいつ: that guy over there (close/rude)
Usage
Not typically used in polite speech. Use 人, 方, or もの instead.