The following are characters in Dubliners who reappear in Ulysses. The source: Michael Groden an English Professor at The University of Western Ontario.

"Two Gallants"

Lenehan: in Aeolus, Wandering Rocks, Sirens, Cyclops, Oxen of the Sun
Corley: in Eumaeus

"A Little Cloud"

Ignatius Gallaher: mentioned at 6:58, 7:626-677

"Counterparts"

Paddy Leonard: in Lestrygonians + mentioned at 6:142, 12:801
Nosey Flynn: in Lestrygonians, Wandering Rocks

"The Boarding House"

Bob Doran: in Cyclops + mentioned at 5:107, 10:984
Polly Mooney: mentioned at 12:398, 12:814
Jack Mooney: mentioned at 8:800, 12:814, 10:984

"A Painful Case"

Mrs Sinico: mentioned at 6:997, 19:947, 17: 1454

"Ivy Day in the Committee Room"

Joe Hynes: in Hades, Aeolus, Cyclops + mentioned at 8:1058, 13:1046, 13:1243, 16:1248
Bantam Lyons: in Lotus Eaters, Wandering Rocks + mentioned at 8:989, 10:517, 12:400, 12:1554
Crofton: in Cyclops + mentioned at 6:247

"A Mother"

Kathleen Kearney: mentioned at 18:376, 18: 878
Hoppy Holohan: mentioned at 5:96, 7:642-44

"Grace"

Tom Kernan: in Hades, Wandering Rocks, Sirens + mentioned at 5:20, 8:372, 8:759-60
Martin Cunningham: in Hades, Wandering Rocks, Cyclops + mentioned at 5:331, 7:165
Jack Power: in Hades, Wandering Rocks, Cyclops + mentioned at 8:419-20
M'Coy: in Lotus Eaters . Wandering Rocks + mentioned at 4:454, 6:114, 6:882-89, 8:596, 16:1260-6
O'Madden Burke: in Aeolus + mentioned at 10:410, 11:270
Fogarty: mentioned at 6:454

"The Dead"

Gabriel Conroy: mentioned at 7:307
Gretta Conroy: mentioned at 4:522
Kate and Julia Morkan: mentioned at 17:140
Bartell d'Arcy: mentioned at 8:181, 10:539, 17:2133, 18:273, 18:1295