Spike is a bit sarcastic and he often laughs at others' misfortunes. But, he is also very helpful and supportive towards Twilight Sparkle. He is also very protective of his masculinity and says he doesn't like anything 'girly', though he can be seen being enthusiastic about stuff like than as any of the others. Spike can be insecure sometimes, for example when he thought Owlowiscious was going to steal his "Number One Assistant" spot away from Twilight Sparkle.

One thing that can seen during the series is that he really enjoys announcing. He got into this first in the episode Fall Weather Friends, where he was going to announce for the Iron Pony Competition, he later got disheartened when Pinkie Pie was already set up as the announcer for the Running of the Leaves, but she then asked him if he wanted to be co-announcer and he had no problem with saying yes. In the episode Suited For Success he continued to do this where he emceed Rarity's fashion show for Hoity-Toity.

So try to sound exactly like him from the show.