Lopaz

Tonica is the femslash ship between Toni and Veronica from the Riverdale fandom.

Canon
Toni meets Veronica on Toni's first day at Riverdale High, following the closure of Southside High. Toni seems pleasantly surprised by Veronica's welcoming demeanor, although she doesn't know the reason behind Veronica playing welcome committee. Veronica also tries to calm the situation soon afterwards, when Reggie and Cheryl attempt to ward off the new Southside students. Veronica formally introduces herself to Toni in the student lounge, aided by Jughead's benevolent teasing affirming to Toni that Veronica's an okay Northsider. Toni introduces herself and Veronica compliments Toni on her last name and Toni seems to like Veronica. They're abruptly interrupted by the Principal calling them out into the hall where Reggie's played a prank in an attempt to tarnish the Southsiders and Veronica stands up to him in their defence.

Fanon
The reaction to Toni/Veronica was always positive, albeit understated in the fandom, until Toni becomes a Vixen and they start spending more time together when Cheryl disappears. Follow their team-up to help Cheryl, the ship took off and has been steadily growing to become a popular femslash ship.

Fandom
AO3

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