I'd like to nominate Alangi Derick (@d3r1ck01) for +2 on mediawiki/*. He's been around for a while now (First merged commit was to Echo in sept 2015), and has contributed to a large number of mediawiki related repositories. He has also been very active mentoring people as part of GCI. In particular, I think him having code review rights will be very helpful with his mentoring students in mentorship programs. I think this contributor has shown good judgment, and I trust him to know which things he is capable of reviewing and giving good reviews for those things.
List of merged commits in gerrit: https://gerrit.wikimedia.org/r/#/q/owner:%22D3r1ck01+%253Calangiderick%2540gmail.com%253E%22+status:merged,25
List of reviews: https://gerrit.wikimedia.org/r/#/q/reviewedby:%22D3r1ck01+%253Calangiderick%2540gmail.com%253E%22,50