excitement, enthusiasm, and mischief?
When Liev gets excited, he grins wide and proud - although depending on the situation, it may be a nasty grin. During battle he pumps his fist in the air or raises his charger. He’ll race around the stage with more intention and gusto than usual, and take more frequent shots. Very occasionally he’ll clap his hands together, usually when he’s in conversation with someone. The only times he gets excited about something are one, when he snipes people with his charger - he takes much pride in his abilities (or at least he did in the past), and nothing beats the rush of a one-shot - or two, when he’s involved in something he has a passion for. Which usually involves the idea of Agent 3 getting what she deserves.
Much like excitement, Liev shows enthusiasm when he is either in the heat of battle or presented with the idea of Agent 3 or his family’s heads on a silver platter. Again he will grin, and go about whatever he’s doing with an odd amount of energy. This he may keep more to himself than excitement.
Liev doesn’t often cause mischief - in fact, if he ever does, I’d be surprised, since he generally takes himself very seriously. I suppose that his form of mischief can be found in the thick of battle while throwing down impeccably-timed Splat Bombs, or while taking someone unaware with a Stingray. In such cases, he tends to reveal a nasty smirk before moving on.
emotions? what are those?