Historical clue formulations

• Close rival, in a sense — 2023-05-28
• Rival you kind of like — 2022-09-18
• Reggie, to Archie, in Archie Comics — 2017-09-15
• Ally who's not completely an ally — 2016-04-26
• Supporter to keep a watchful eye on — 2013-04-20
• Semi-opponent — 2013-02-01