wakuwaku (spy x family)
Based on an screencap of the first episode of the Spy × Family anime, in which Anya appears excited while thinking the onomatopoeia for excitement, わくわく (wakuwaku), from above with +_+, clenched hands, open mouth, looking up, hands up, blush, and raised eyebrows.
Examples
- A screencap redraw of the scene: post #5331489
- An official style parody: post #5452111