Looker wears black penny loafers, brown suit pants, white shirt with pink tie, lighter brown vest and an investigator coat. He has brown eyes, dark hair, wrinkle marks around his mouth, black eyebrows and an inquisitive look.
Looker is very creative and figures out things at any risk being held. He is also a caring man with a good heart, caring for those who cannot take care of themselves, and values the friends he makes. But most the time, he is a little strict, holding cases for one thing, and prefers pondering a lot rather than expressing himself through words. He is quite dedicated to his job, and becomes serious when it comes to crime fighting.
Diamond, Pearl, and Platinum
Looker makes his debut in Pokémon Platinum Version. He first appears in Jubilife City, where he introduces himself to the player character. He appears often in the game to aid the player character, although not necessarily with battles. He is on a mission to stop Team Galactic from causing havoc in the Sinnoh region. After stumbling upon Charon's notes at the Team Galactic HQ in Veilstone City, Looker eventually arrests Charon, one of the team's four commanders.
Black and White
Looker returns in Pokémon Black and White Version. After completing the Elite Four, and after completing N's Castle, the player character can go back to his/her house and meet Looker, who is disguised as the player character's mother. He then gives the player character a Super Rod. He tells them to look around the Unova region to find the Sage members of Team Plasma, since some of them escaped.
X and Y
Looker returns once again in [[Pokémon X and Y]. After defeating the Elite Four and Diantha, the Pokémon Champion of Kalos, one will receive a Holo Caster call from Looker who has not yet revealed himself and will tell to meet up in his Headquarters near Rouge Plaza in Lumiose City. This starts the beginning of a post-game side quest story which ends in Looker capturing the mastermind behind Team Flare and him leaving the region.
Omega Ruby and Alpha Sapphire
Looker once again returns in Pokémon Omega Ruby and Alpha Sapphire. After getting access to the Battle Resort, if going east and a little north from the bridge one has entered the resort in, one will encounter Looker who is washed ashore and dehydrated, asking the player character where he is, giving the choice of saying "Hoenn region" or "Battle Resort". Then a woman (with the Beauty Trainer Class model) comes by asking what happened. She said she has no other choice than to bring him to the cottage. When going to the northeastern cottage in the place where the Dragon Tamer says about changing his Druddigon's Ability, one will find Looker. When talking to the lady, she says he has a bad case of amnesia. When talking to Looker he says what he can only remember, when he was washed ashore and meeting the player character. To thank the player character for saving him, he gives them an Audinite, the Mega Stone for Audino, where he then asks to himself who he is.
Sun and Moon
Yet again, Looker makes his appearance in Pokémon Sun and Moon. This time, he is investigating the Ultra Beasts with Salon Maiden Anabel. The first task he gives the player is to go to Aether Paradise to investigate an Ultra Beast. These games also revealed that ten years ago, Looker and Nanu were teammates in the same squad to capture a Guzzlord, but their mission failed due to their inadequate strength and wrong strategies, coupled with their sympathy towards the Guzzlord, which led to the fall of their Faller teammate. But both then found an amnesic Anabel and took her in.
- He bears a striking resemblance to David Tennant's incarnation of the Doctor on Doctor Who.
- He used to have a Croagunk in Platinum, but as in XY he told Calem/Serena that his partner Pokémon had long passed away, which judging by the colors of his desk's photograph his deceased partner might be Croagunk. Therefore, by the time in Sun and Moon, he no longer has a partner Pokémon.
- Looker is the character that has visited the most amount of regions: Hoenn, Sinnoh, Unova, Kalos, and Alola.
- According to Nanu, Looker's former codename was called "836".