The situation is as follows:
After a college alumni event, old classmates are all sitting in a roundtable to discuss which restaurant they should go to eat that night. There are total of 8 guys and 8 girls. As one guy asks, "Where should we eat?" others reply, "I don't care", "I don't mind. Anything is good", or "Whatever you want, man". For few rounds, nobody brings an opinion on where they want to dine in, except to leave comments such as, "I'm so hungry. I can eat a horse now".
Then, Peter stands up and say "Let's go to XXX. They have really nice foods and the prices are reasonable. We have to check this place out. I can guarantee you'll all love it!! Let's go!"
Question: What's the best word or expression to describe Peter's personality or the act of what Peter just did (made an opinion amongst a group in assertive manner) in this situation?
Example: decisive, assertive, charismatic
COMMENT: Please suggest me if you have any slang that fits in this context.