Scott Caldwell as Renee Howard (seasons 1вЂ“2), Rome's mother Gerald McRaney (season 1) and Paul Guilfoyle (season 2) as Lenny Farache, Delilah's father and Sophie, Danny, and CharlieвЂ™s grandfather who has Alzheimer's disease.Sam Huntington as Tom (seasons 1 and 4), a man Maggie dated when she lived in Chicago, described as a 'mystery man' from her past in early press.Cameron Esposito as Greta Strobe (season 4), Katherine's former high school best friend and current girlfriend.Nikiva Dionne as Shanice Williamson (seasons 3вЂ“4), a well-known actress and closeted lesbian who agreed to star in Rome's film before the COVID pandemic shut it down she later becomes a potential love interest for Katherine.Terry Chen as Alan (season 3), a lawyer with whom Katherine forms a friendship and possible romantic relationship as her marriage to Eddie falls apart.Karen Robinson as Florence (season 3).Andrew Leeds as Peter Benoit (seasons 3вЂ“4), a music instructor who mentors Sophie when she attempts to get accepted into the exclusive music college MMI, and subsequently sexually abuses her.Adam Swain as Tyrell (season 3 guest season 4), an industrious teenager taken in by Rome and Regina after his mother is deported to Haiti.Mattia Castrillo as Liam (seasons 3вЂ“4), a classmate of Theo's who is Darcy's son with her ex-husband.Chris Geere as Jamie (season 3), Maggie's Oxford roommate and friend with benefits.

Anna Akana as Dakota (season 2 guest season 3), a young musician with whom Eddie produced music.

Ebboney Wilson as Eve (season 2), a young pregnant woman who was planning on giving up her baby for Rome and Regina to adopt but decided to keep the baby.

as Walter Howard (season 2вЂ“present guest season 1), Rome's father. He reveals that the heart actually went to his fiancГ©e, who was killed in a car crash that Eric caused.

Jason Ritter as Eric (season 2), a man who claimed to have Maggie's deceased brother's heart.

Rhys Coiro as Mitch Nelson (season 2 guest season 1), Barbara's husband.

Melora Hardin as Patricia Bloom (season 2 guest season 1), Maggie's mother.

Chandler Riggs as PJ Nelson (season 2 guest season 1), a young man who befriends Rome, later revealed to be Barbara Morgan's son.

Drea de Matteo as Barbara Nelson (seasons 1вЂ“2), a mysterious woman from Jon's past.

Sam Pancake as Carter French, Katherine's legal assistant.

Henderson Wade as Hunter (season 1), Katherine's co-worker.

Bodhi Sabongui as Elliot (season 1 guest season 2), Danny's crush and later boyfriend.

Constance Zimmer as Jeri Huntington (season 1), a councilwoman.

Ron Livingston as Jon Dixon (season 1 guest season 2вЂ“3), a successful businessman who unexpectedly takes his own life.Floriana Lima as Darcy Cooper (season 3 recurring season 2, 4), Gary's new love interest, a single mother to Theo's classmate Liam, and a veteran of military service in Afghanistan experiencing PTSD.Chance Hurstfield as Danny Dixon (season 2вЂ“present recurring season 1), Jon and Delilah's son, Sophie's younger brother, and Charlie's older half-brother.Lizzy Greene as Sophie Dixon, Jon and Delilah's oldest child, Danny's older sister and Charlie's older half-sister.Tristan Byon as Theo Saville, Eddie and Katherine's son, and Charlie's older half-brother.StГ©phanie Szostak as Delilah Dixon (seasons 1вЂ“3 recurring season 4), Jon's widow and mother of Sophie, Danny and Charlie.His birth name is revealed in season 3 to be Javier Mendez Jr. James Roday Rodriguez as Gary Mendez, a friend of Eddie, Jon, and Rome, and a survivor of breast cancer.Grace Park as Katherine Kim, who used to be the fun one of the group, but now juggles her career as a lawyer with parenting her son, Theo, while trying to repair her marriage.Christina Ochoa as Ashley Morales (season 1), Jon's assistant.Christina Moses as Regina Howard, a chef who wants to open her own restaurant.Allison Miller as Maggie Bloom, a therapist and Gary's ex-girlfriend who also survived breast cancer.Romany Malco as Rome Howard, an aspiring filmmaker who yearns to accomplish something more meaningful with his life.David Giuntoli as Eddie Saville, a musician, music teacher and stay-at-home dad who is a recovering alcoholic having marital problems with Katherine.The title is a reference to the saying 'Friendship isn't a big thing вЂ“ it's a million little things'.Д¬ast and characters Main The friends realize that they need to finally start living life as they cope with their loss. In Boston, a tight-knit circle of friends is shocked after a member of the group unexpectedly dies by suicide.

Million little pieces