The channel and the design agency Addiction have created a new daytime logo, new channel idents and an animated character called Phinneas.
Trouble is also launching an evening strand, which will air from 9pm.
Trouble Later will carry edgier drama, such as the US import The Sausage Factory, and cult animation, such as The Wrong Coast.
The new idents and logo will be replicated on the Trouble website, www.trouble.co.uk, where users can play a Pac-Man-style game. Trouble is also introducing an entertainment and gossip microsite.
Anthony Van Someren, the creative director of Trouble, said: "Most TV channel branding aimed at young viewers is either safe and predictable or quirky but meaningless and throwaway. We decided to do something that would stand out in terms of design and rationale."
Jonathan Webb, the director of programming at Trouble, said: "Teenagers are increasingly mature in their aspirations, to the extent that to define this audience by age is to miss the point entirely. The new-look Trouble is celebrating the spirit of youth - what it means to be young and British in the noughties."