This page shows tables of all heroes summonable at each rarity. Focus summoning is not considered, and varies from focus to focus, see Summoning Focus List. Quests and Hero Battle Rotation can grant heroes at other rarities than Summoning. Heroes only available through Grand Hero Battles, or Story Maps cannot be summoned, and are not listed here, but a chart including all heroes can be found at Free Units, or Hero Availability Chart.
This table shows which units in the general summoning pool are summonable at which rarities, separated by weapon type. Note that heroes that can be summoned at several rarities appear once on each row that applies to them. This table is a representation of the "details" list available for summoning focuses in-game, without the focus-units.
The above table, in numbers by color only.