Bluegill, Pumpkinseed and Green are the three that are found in the GTA.
Northern Sunfish is found in SW Ontario, Parry Sound and NW Ontario, but none of these areas are considered GTA.
Warmouth is a Species At Risk and found only at Point Pelee according to COSEWIC report.
Orangespotted Sunfish is a Species At Risk and are found in a very small corner of SW Ontario between Lake Erie and Lake St. Clair according to COSEWIC report.
There's the odd report of Redear Sunfish in Lake Erie (US side) and St. Lawrence River (mostly US side), but that's usually due to bait bucket introduction. They are considered as an invasive species.