Is CHARSET important for tables with INT only? My server default CHARSET is UTF-8 (set in my.cnf). I create tables like
CREATE TABLE t1
(
ID int(11) unsigned NOT NULL AUTO_INCREMENT,
Title varchar(255),
PRIMARY KEY(ID)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE utf8_general_ci KEY_BLOCK_SIZE=2

but some tables have only int columns. Is it beneficial to use latin charset for them? Or is it better to have all tables with UTF-8 charset for consistency?
CREATE TABLE t2
(
ID int(11) unsigned NOT NULL,
TagID int(11) unsigned NOT NULL,
PRIMARY KEY(ID,TagID)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE utf8_general_ci KEY_BLOCK_SIZE=1

vs.
CREATE TABLE t2
(
ID int(11) unsigned NOT NULL,
TagID int(11) unsigned NOT NULL,
PRIMARY KEY(ID,TagID)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE latin1_swedish_ci KEY_BLOCK_SIZE=1
The character set and collation of a table affects the newly created columns in that table. It also affects char/text columns without a specified character set/collation.
So your int only tables don't have any specific difference because of character set, until you add a column that uses it.