Nimble is a simple mod that adds smooth transition animation on player perspective changes. It also makes screen rolls when you fly using elytra, and switches perspective when riding a vehicle.

The third-person front view now requires holding F4.

Client-side only. All these features can be disabled or configured if you have installed Kiwi. Besides, in-game config UI is provided if you have installed Cloth Config

Elytra: https://imgur.com/a/DufQUv2

>> Fabric Edition

Thanks to quat1024's Auto Third Person for the inspiration